This shows all the functions supported by the system, and custom functions
Array
(
    [internal] => Array
        (
            [0] => zend_version
            [1] => func_num_args
            [2] => func_get_arg
            [3] => func_get_args
            [4] => strlen
            [5] => strcmp
            [6] => strncmp
            [7] => strcasecmp
            [8] => strncasecmp
            [9] => each
            [10] => error_reporting
            [11] => define
            [12] => defined
            [13] => get_class
            [14] => get_called_class
            [15] => get_parent_class
            [16] => method_exists
            [17] => property_exists
            [18] => class_exists
            [19] => interface_exists
            [20] => trait_exists
            [21] => function_exists
            [22] => class_alias
            [23] => get_included_files
            [24] => get_required_files
            [25] => is_subclass_of
            [26] => is_a
            [27] => get_class_vars
            [28] => get_object_vars
            [29] => get_class_methods
            [30] => trigger_error
            [31] => user_error
            [32] => set_error_handler
            [33] => restore_error_handler
            [34] => set_exception_handler
            [35] => restore_exception_handler
            [36] => get_declared_classes
            [37] => get_declared_traits
            [38] => get_declared_interfaces
            [39] => get_defined_functions
            [40] => get_defined_vars
            [41] => create_function
            [42] => get_resource_type
            [43] => get_loaded_extensions
            [44] => extension_loaded
            [45] => get_extension_funcs
            [46] => get_defined_constants
            [47] => debug_backtrace
            [48] => debug_print_backtrace
            [49] => gc_collect_cycles
            [50] => gc_enabled
            [51] => gc_enable
            [52] => gc_disable
            [53] => strtotime
            [54] => date
            [55] => idate
            [56] => gmdate
            [57] => mktime
            [58] => gmmktime
            [59] => checkdate
            [60] => strftime
            [61] => gmstrftime
            [62] => time
            [63] => localtime
            [64] => getdate
            [65] => date_create
            [66] => date_create_immutable
            [67] => date_create_from_format
            [68] => date_create_immutable_from_format
            [69] => date_parse
            [70] => date_parse_from_format
            [71] => date_get_last_errors
            [72] => date_format
            [73] => date_modify
            [74] => date_add
            [75] => date_sub
            [76] => date_timezone_get
            [77] => date_timezone_set
            [78] => date_offset_get
            [79] => date_diff
            [80] => date_time_set
            [81] => date_date_set
            [82] => date_isodate_set
            [83] => date_timestamp_set
            [84] => date_timestamp_get
            [85] => timezone_open
            [86] => timezone_name_get
            [87] => timezone_name_from_abbr
            [88] => timezone_offset_get
            [89] => timezone_transitions_get
            [90] => timezone_location_get
            [91] => timezone_identifiers_list
            [92] => timezone_abbreviations_list
            [93] => timezone_version_get
            [94] => date_interval_create_from_date_string
            [95] => date_interval_format
            [96] => date_default_timezone_set
            [97] => date_default_timezone_get
            [98] => date_sunrise
            [99] => date_sunset
            [100] => date_sun_info
            [101] => ereg
            [102] => ereg_replace
            [103] => eregi
            [104] => eregi_replace
            [105] => split
            [106] => spliti
            [107] => sql_regcase
            [108] => libxml_set_streams_context
            [109] => libxml_use_internal_errors
            [110] => libxml_get_last_error
            [111] => libxml_clear_errors
            [112] => libxml_get_errors
            [113] => libxml_disable_entity_loader
            [114] => libxml_set_external_entity_loader
            [115] => openssl_get_cert_locations
            [116] => openssl_spki_new
            [117] => openssl_spki_verify
            [118] => openssl_spki_export
            [119] => openssl_spki_export_challenge
            [120] => openssl_pkey_free
            [121] => openssl_pkey_new
            [122] => openssl_pkey_export
            [123] => openssl_pkey_export_to_file
            [124] => openssl_pkey_get_private
            [125] => openssl_pkey_get_public
            [126] => openssl_pkey_get_details
            [127] => openssl_free_key
            [128] => openssl_get_privatekey
            [129] => openssl_get_publickey
            [130] => openssl_x509_read
            [131] => openssl_x509_free
            [132] => openssl_x509_parse
            [133] => openssl_x509_checkpurpose
            [134] => openssl_x509_check_private_key
            [135] => openssl_x509_export
            [136] => openssl_x509_fingerprint
            [137] => openssl_x509_export_to_file
            [138] => openssl_pkcs12_export
            [139] => openssl_pkcs12_export_to_file
            [140] => openssl_pkcs12_read
            [141] => openssl_csr_new
            [142] => openssl_csr_export
            [143] => openssl_csr_export_to_file
            [144] => openssl_csr_sign
            [145] => openssl_csr_get_subject
            [146] => openssl_csr_get_public_key
            [147] => openssl_digest
            [148] => openssl_encrypt
            [149] => openssl_decrypt
            [150] => openssl_cipher_iv_length
            [151] => openssl_sign
            [152] => openssl_verify
            [153] => openssl_seal
            [154] => openssl_open
            [155] => openssl_pbkdf2
            [156] => openssl_pkcs7_verify
            [157] => openssl_pkcs7_decrypt
            [158] => openssl_pkcs7_sign
            [159] => openssl_pkcs7_encrypt
            [160] => openssl_private_encrypt
            [161] => openssl_private_decrypt
            [162] => openssl_public_encrypt
            [163] => openssl_public_decrypt
            [164] => openssl_get_md_methods
            [165] => openssl_get_cipher_methods
            [166] => openssl_dh_compute_key
            [167] => openssl_random_pseudo_bytes
            [168] => openssl_error_string
            [169] => preg_match
            [170] => preg_match_all
            [171] => preg_replace
            [172] => preg_replace_callback
            [173] => preg_filter
            [174] => preg_split
            [175] => preg_quote
            [176] => preg_grep
            [177] => preg_last_error
            [178] => readgzfile
            [179] => gzrewind
            [180] => gzclose
            [181] => gzeof
            [182] => gzgetc
            [183] => gzgets
            [184] => gzgetss
            [185] => gzread
            [186] => gzopen
            [187] => gzpassthru
            [188] => gzseek
            [189] => gztell
            [190] => gzwrite
            [191] => gzputs
            [192] => gzfile
            [193] => gzcompress
            [194] => gzuncompress
            [195] => gzdeflate
            [196] => gzinflate
            [197] => gzencode
            [198] => gzdecode
            [199] => zlib_encode
            [200] => zlib_decode
            [201] => zlib_get_coding_type
            [202] => ob_gzhandler
            [203] => bcadd
            [204] => bcsub
            [205] => bcmul
            [206] => bcdiv
            [207] => bcmod
            [208] => bcpow
            [209] => bcsqrt
            [210] => bcscale
            [211] => bccomp
            [212] => bcpowmod
            [213] => ctype_alnum
            [214] => ctype_alpha
            [215] => ctype_cntrl
            [216] => ctype_digit
            [217] => ctype_lower
            [218] => ctype_graph
            [219] => ctype_print
            [220] => ctype_punct
            [221] => ctype_space
            [222] => ctype_upper
            [223] => ctype_xdigit
            [224] => curl_init
            [225] => curl_copy_handle
            [226] => curl_version
            [227] => curl_setopt
            [228] => curl_setopt_array
            [229] => curl_exec
            [230] => curl_getinfo
            [231] => curl_error
            [232] => curl_errno
            [233] => curl_close
            [234] => curl_strerror
            [235] => curl_multi_strerror
            [236] => curl_reset
            [237] => curl_escape
            [238] => curl_unescape
            [239] => curl_pause
            [240] => curl_multi_init
            [241] => curl_multi_add_handle
            [242] => curl_multi_remove_handle
            [243] => curl_multi_select
            [244] => curl_multi_exec
            [245] => curl_multi_getcontent
            [246] => curl_multi_info_read
            [247] => curl_multi_close
            [248] => curl_multi_setopt
            [249] => curl_share_init
            [250] => curl_share_close
            [251] => curl_share_setopt
            [252] => curl_file_create
            [253] => dom_import_simplexml
            [254] => finfo_open
            [255] => finfo_close
            [256] => finfo_set_flags
            [257] => finfo_file
            [258] => finfo_buffer
            [259] => mime_content_type
            [260] => filter_input
            [261] => filter_var
            [262] => filter_input_array
            [263] => filter_var_array
            [264] => filter_list
            [265] => filter_has_var
            [266] => filter_id
            [267] => ftp_connect
            [268] => ftp_ssl_connect
            [269] => ftp_login
            [270] => ftp_pwd
            [271] => ftp_cdup
            [272] => ftp_chdir
            [273] => ftp_exec
            [274] => ftp_raw
            [275] => ftp_mkdir
            [276] => ftp_rmdir
            [277] => ftp_chmod
            [278] => ftp_alloc
            [279] => ftp_nlist
            [280] => ftp_rawlist
            [281] => ftp_systype
            [282] => ftp_pasv
            [283] => ftp_get
            [284] => ftp_fget
            [285] => ftp_put
            [286] => ftp_fput
            [287] => ftp_size
            [288] => ftp_mdtm
            [289] => ftp_rename
            [290] => ftp_delete
            [291] => ftp_site
            [292] => ftp_close
            [293] => ftp_set_option
            [294] => ftp_get_option
            [295] => ftp_nb_fget
            [296] => ftp_nb_get
            [297] => ftp_nb_continue
            [298] => ftp_nb_put
            [299] => ftp_nb_fput
            [300] => ftp_quit
            [301] => gd_info
            [302] => imagearc
            [303] => imageellipse
            [304] => imagechar
            [305] => imagecharup
            [306] => imagecolorat
            [307] => imagecolorallocate
            [308] => imagepalettecopy
            [309] => imagecreatefromstring
            [310] => imagecolorclosest
            [311] => imagecolorclosesthwb
            [312] => imagecolordeallocate
            [313] => imagecolorresolve
            [314] => imagecolorexact
            [315] => imagecolorset
            [316] => imagecolortransparent
            [317] => imagecolorstotal
            [318] => imagecolorsforindex
            [319] => imagecopy
            [320] => imagecopymerge
            [321] => imagecopymergegray
            [322] => imagecopyresized
            [323] => imagecreate
            [324] => imagecreatetruecolor
            [325] => imageistruecolor
            [326] => imagetruecolortopalette
            [327] => imagepalettetotruecolor
            [328] => imagesetthickness
            [329] => imagefilledarc
            [330] => imagefilledellipse
            [331] => imagealphablending
            [332] => imagesavealpha
            [333] => imagecolorallocatealpha
            [334] => imagecolorresolvealpha
            [335] => imagecolorclosestalpha
            [336] => imagecolorexactalpha
            [337] => imagecopyresampled
            [338] => imagerotate
            [339] => imageflip
            [340] => imageantialias
            [341] => imagecrop
            [342] => imagecropauto
            [343] => imagescale
            [344] => imageaffine
            [345] => imageaffinematrixconcat
            [346] => imageaffinematrixget
            [347] => imagesetinterpolation
            [348] => imagesettile
            [349] => imagesetbrush
            [350] => imagesetstyle
            [351] => imagecreatefrompng
            [352] => imagecreatefromgif
            [353] => imagecreatefromjpeg
            [354] => imagecreatefromwbmp
            [355] => imagecreatefromxbm
            [356] => imagecreatefromgd
            [357] => imagecreatefromgd2
            [358] => imagecreatefromgd2part
            [359] => imagepng
            [360] => imagegif
            [361] => imagejpeg
            [362] => imagewbmp
            [363] => imagegd
            [364] => imagegd2
            [365] => imagedestroy
            [366] => imagegammacorrect
            [367] => imagefill
            [368] => imagefilledpolygon
            [369] => imagefilledrectangle
            [370] => imagefilltoborder
            [371] => imagefontwidth
            [372] => imagefontheight
            [373] => imageinterlace
            [374] => imageline
            [375] => imageloadfont
            [376] => imagepolygon
            [377] => imagerectangle
            [378] => imagesetpixel
            [379] => imagestring
            [380] => imagestringup
            [381] => imagesx
            [382] => imagesy
            [383] => imagedashedline
            [384] => imagettfbbox
            [385] => imagettftext
            [386] => imageftbbox
            [387] => imagefttext
            [388] => imagetypes
            [389] => jpeg2wbmp
            [390] => png2wbmp
            [391] => image2wbmp
            [392] => imagelayereffect
            [393] => imagexbm
            [394] => imagecolormatch
            [395] => imagefilter
            [396] => imageconvolution
            [397] => gmp_init
            [398] => gmp_import
            [399] => gmp_export
            [400] => gmp_intval
            [401] => gmp_strval
            [402] => gmp_add
            [403] => gmp_sub
            [404] => gmp_mul
            [405] => gmp_div_qr
            [406] => gmp_div_q
            [407] => gmp_div_r
            [408] => gmp_div
            [409] => gmp_mod
            [410] => gmp_divexact
            [411] => gmp_neg
            [412] => gmp_abs
            [413] => gmp_fact
            [414] => gmp_sqrt
            [415] => gmp_sqrtrem
            [416] => gmp_root
            [417] => gmp_rootrem
            [418] => gmp_pow
            [419] => gmp_powm
            [420] => gmp_perfect_square
            [421] => gmp_prob_prime
            [422] => gmp_gcd
            [423] => gmp_gcdext
            [424] => gmp_invert
            [425] => gmp_jacobi
            [426] => gmp_legendre
            [427] => gmp_cmp
            [428] => gmp_sign
            [429] => gmp_random
            [430] => gmp_random_bits
            [431] => gmp_random_range
            [432] => gmp_and
            [433] => gmp_or
            [434] => gmp_com
            [435] => gmp_xor
            [436] => gmp_setbit
            [437] => gmp_clrbit
            [438] => gmp_testbit
            [439] => gmp_scan0
            [440] => gmp_scan1
            [441] => gmp_popcount
            [442] => gmp_hamdist
            [443] => gmp_nextprime
            [444] => hash
            [445] => hash_file
            [446] => hash_hmac
            [447] => hash_hmac_file
            [448] => hash_init
            [449] => hash_update
            [450] => hash_update_stream
            [451] => hash_update_file
            [452] => hash_final
            [453] => hash_copy
            [454] => hash_algos
            [455] => hash_pbkdf2
            [456] => hash_equals
            [457] => mhash_keygen_s2k
            [458] => mhash_get_block_size
            [459] => mhash_get_hash_name
            [460] => mhash_count
            [461] => mhash
            [462] => iconv
            [463] => iconv_get_encoding
            [464] => iconv_set_encoding
            [465] => iconv_strlen
            [466] => iconv_substr
            [467] => iconv_strpos
            [468] => iconv_strrpos
            [469] => iconv_mime_encode
            [470] => iconv_mime_decode
            [471] => iconv_mime_decode_headers
            [472] => imap_open
            [473] => imap_reopen
            [474] => imap_close
            [475] => imap_num_msg
            [476] => imap_num_recent
            [477] => imap_headers
            [478] => imap_headerinfo
            [479] => imap_rfc822_parse_headers
            [480] => imap_rfc822_write_address
            [481] => imap_rfc822_parse_adrlist
            [482] => imap_body
            [483] => imap_bodystruct
            [484] => imap_fetchbody
            [485] => imap_fetchmime
            [486] => imap_savebody
            [487] => imap_fetchheader
            [488] => imap_fetchstructure
            [489] => imap_gc
            [490] => imap_expunge
            [491] => imap_delete
            [492] => imap_undelete
            [493] => imap_check
            [494] => imap_listscan
            [495] => imap_mail_copy
            [496] => imap_mail_move
            [497] => imap_mail_compose
            [498] => imap_createmailbox
            [499] => imap_renamemailbox
            [500] => imap_deletemailbox
            [501] => imap_subscribe
            [502] => imap_unsubscribe
            [503] => imap_append
            [504] => imap_ping
            [505] => imap_base64
            [506] => imap_qprint
            [507] => imap_8bit
            [508] => imap_binary
            [509] => imap_utf8
            [510] => imap_status
            [511] => imap_mailboxmsginfo
            [512] => imap_setflag_full
            [513] => imap_clearflag_full
            [514] => imap_sort
            [515] => imap_uid
            [516] => imap_msgno
            [517] => imap_list
            [518] => imap_lsub
            [519] => imap_fetch_overview
            [520] => imap_alerts
            [521] => imap_errors
            [522] => imap_last_error
            [523] => imap_search
            [524] => imap_utf7_decode
            [525] => imap_utf7_encode
            [526] => imap_utf8_to_mutf7
            [527] => imap_mutf7_to_utf8
            [528] => imap_mime_header_decode
            [529] => imap_thread
            [530] => imap_timeout
            [531] => imap_get_quota
            [532] => imap_get_quotaroot
            [533] => imap_set_quota
            [534] => imap_setacl
            [535] => imap_getacl
            [536] => imap_mail
            [537] => imap_header
            [538] => imap_listmailbox
            [539] => imap_getmailboxes
            [540] => imap_scanmailbox
            [541] => imap_listsubscribed
            [542] => imap_getsubscribed
            [543] => imap_fetchtext
            [544] => imap_scan
            [545] => imap_create
            [546] => imap_rename
            [547] => json_encode
            [548] => json_decode
            [549] => json_last_error
            [550] => json_last_error_msg
            [551] => mb_convert_case
            [552] => mb_strtoupper
            [553] => mb_strtolower
            [554] => mb_language
            [555] => mb_internal_encoding
            [556] => mb_http_input
            [557] => mb_http_output
            [558] => mb_detect_order
            [559] => mb_substitute_character
            [560] => mb_parse_str
            [561] => mb_output_handler
            [562] => mb_preferred_mime_name
            [563] => mb_strlen
            [564] => mb_strpos
            [565] => mb_strrpos
            [566] => mb_stripos
            [567] => mb_strripos
            [568] => mb_strstr
            [569] => mb_strrchr
            [570] => mb_stristr
            [571] => mb_strrichr
            [572] => mb_substr_count
            [573] => mb_substr
            [574] => mb_strcut
            [575] => mb_strwidth
            [576] => mb_strimwidth
            [577] => mb_convert_encoding
            [578] => mb_detect_encoding
            [579] => mb_list_encodings
            [580] => mb_encoding_aliases
            [581] => mb_convert_kana
            [582] => mb_encode_mimeheader
            [583] => mb_decode_mimeheader
            [584] => mb_convert_variables
            [585] => mb_encode_numericentity
            [586] => mb_decode_numericentity
            [587] => mb_send_mail
            [588] => mb_get_info
            [589] => mb_check_encoding
            [590] => mb_regex_encoding
            [591] => mb_regex_set_options
            [592] => mb_ereg
            [593] => mb_eregi
            [594] => mb_ereg_replace
            [595] => mb_eregi_replace
            [596] => mb_ereg_replace_callback
            [597] => mb_split
            [598] => mb_ereg_match
            [599] => mb_ereg_search
            [600] => mb_ereg_search_pos
            [601] => mb_ereg_search_regs
            [602] => mb_ereg_search_init
            [603] => mb_ereg_search_getregs
            [604] => mb_ereg_search_getpos
            [605] => mb_ereg_search_setpos
            [606] => mbregex_encoding
            [607] => mbereg
            [608] => mberegi
            [609] => mbereg_replace
            [610] => mberegi_replace
            [611] => mbsplit
            [612] => mbereg_match
            [613] => mbereg_search
            [614] => mbereg_search_pos
            [615] => mbereg_search_regs
            [616] => mbereg_search_init
            [617] => mbereg_search_getregs
            [618] => mbereg_search_getpos
            [619] => mbereg_search_setpos
            [620] => mcrypt_ecb
            [621] => mcrypt_cbc
            [622] => mcrypt_cfb
            [623] => mcrypt_ofb
            [624] => mcrypt_get_key_size
            [625] => mcrypt_get_block_size
            [626] => mcrypt_get_cipher_name
            [627] => mcrypt_create_iv
            [628] => mcrypt_list_algorithms
            [629] => mcrypt_list_modes
            [630] => mcrypt_get_iv_size
            [631] => mcrypt_encrypt
            [632] => mcrypt_decrypt
            [633] => mcrypt_module_open
            [634] => mcrypt_generic_init
            [635] => mcrypt_generic
            [636] => mdecrypt_generic
            [637] => mcrypt_generic_end
            [638] => mcrypt_generic_deinit
            [639] => mcrypt_enc_self_test
            [640] => mcrypt_enc_is_block_algorithm_mode
            [641] => mcrypt_enc_is_block_algorithm
            [642] => mcrypt_enc_is_block_mode
            [643] => mcrypt_enc_get_block_size
            [644] => mcrypt_enc_get_key_size
            [645] => mcrypt_enc_get_supported_key_sizes
            [646] => mcrypt_enc_get_iv_size
            [647] => mcrypt_enc_get_algorithms_name
            [648] => mcrypt_enc_get_modes_name
            [649] => mcrypt_module_self_test
            [650] => mcrypt_module_is_block_algorithm_mode
            [651] => mcrypt_module_is_block_algorithm
            [652] => mcrypt_module_is_block_mode
            [653] => mcrypt_module_get_algo_block_size
            [654] => mcrypt_module_get_algo_key_size
            [655] => mcrypt_module_get_supported_key_sizes
            [656] => mcrypt_module_close
            [657] => mysql_connect
            [658] => mysql_pconnect
            [659] => mysql_close
            [660] => mysql_select_db
            [661] => mysql_query
            [662] => mysql_unbuffered_query
            [663] => mysql_db_query
            [664] => mysql_list_dbs
            [665] => mysql_list_tables
            [666] => mysql_list_fields
            [667] => mysql_list_processes
            [668] => mysql_error
            [669] => mysql_errno
            [670] => mysql_affected_rows
            [671] => mysql_insert_id
            [672] => mysql_result
            [673] => mysql_num_rows
            [674] => mysql_num_fields
            [675] => mysql_fetch_row
            [676] => mysql_fetch_array
            [677] => mysql_fetch_assoc
            [678] => mysql_fetch_object
            [679] => mysql_data_seek
            [680] => mysql_fetch_lengths
            [681] => mysql_fetch_field
            [682] => mysql_field_seek
            [683] => mysql_free_result
            [684] => mysql_field_name
            [685] => mysql_field_table
            [686] => mysql_field_len
            [687] => mysql_field_type
            [688] => mysql_field_flags
            [689] => mysql_escape_string
            [690] => mysql_real_escape_string
            [691] => mysql_stat
            [692] => mysql_thread_id
            [693] => mysql_client_encoding
            [694] => mysql_ping
            [695] => mysql_get_client_info
            [696] => mysql_get_host_info
            [697] => mysql_get_proto_info
            [698] => mysql_get_server_info
            [699] => mysql_info
            [700] => mysql_set_charset
            [701] => mysql
            [702] => mysql_fieldname
            [703] => mysql_fieldtable
            [704] => mysql_fieldlen
            [705] => mysql_fieldtype
            [706] => mysql_fieldflags
            [707] => mysql_selectdb
            [708] => mysql_freeresult
            [709] => mysql_numfields
            [710] => mysql_numrows
            [711] => mysql_listdbs
            [712] => mysql_listtables
            [713] => mysql_listfields
            [714] => mysql_db_name
            [715] => mysql_dbname
            [716] => mysql_tablename
            [717] => mysql_table_name
            [718] => mysqli_affected_rows
            [719] => mysqli_autocommit
            [720] => mysqli_begin_transaction
            [721] => mysqli_change_user
            [722] => mysqli_character_set_name
            [723] => mysqli_close
            [724] => mysqli_commit
            [725] => mysqli_connect
            [726] => mysqli_connect_errno
            [727] => mysqli_connect_error
            [728] => mysqli_data_seek
            [729] => mysqli_dump_debug_info
            [730] => mysqli_debug
            [731] => mysqli_errno
            [732] => mysqli_error
            [733] => mysqli_error_list
            [734] => mysqli_stmt_execute
            [735] => mysqli_execute
            [736] => mysqli_fetch_field
            [737] => mysqli_fetch_fields
            [738] => mysqli_fetch_field_direct
            [739] => mysqli_fetch_lengths
            [740] => mysqli_fetch_all
            [741] => mysqli_fetch_array
            [742] => mysqli_fetch_assoc
            [743] => mysqli_fetch_object
            [744] => mysqli_fetch_row
            [745] => mysqli_field_count
            [746] => mysqli_field_seek
            [747] => mysqli_field_tell
            [748] => mysqli_free_result
            [749] => mysqli_get_connection_stats
            [750] => mysqli_get_client_stats
            [751] => mysqli_get_charset
            [752] => mysqli_get_client_info
            [753] => mysqli_get_client_version
            [754] => mysqli_get_links_stats
            [755] => mysqli_get_host_info
            [756] => mysqli_get_proto_info
            [757] => mysqli_get_server_info
            [758] => mysqli_get_server_version
            [759] => mysqli_get_warnings
            [760] => mysqli_init
            [761] => mysqli_info
            [762] => mysqli_insert_id
            [763] => mysqli_kill
            [764] => mysqli_more_results
            [765] => mysqli_multi_query
            [766] => mysqli_next_result
            [767] => mysqli_num_fields
            [768] => mysqli_num_rows
            [769] => mysqli_options
            [770] => mysqli_ping
            [771] => mysqli_poll
            [772] => mysqli_prepare
            [773] => mysqli_report
            [774] => mysqli_query
            [775] => mysqli_real_connect
            [776] => mysqli_real_escape_string
            [777] => mysqli_real_query
            [778] => mysqli_reap_async_query
            [779] => mysqli_release_savepoint
            [780] => mysqli_rollback
            [781] => mysqli_savepoint
            [782] => mysqli_select_db
            [783] => mysqli_set_charset
            [784] => mysqli_stmt_affected_rows
            [785] => mysqli_stmt_attr_get
            [786] => mysqli_stmt_attr_set
            [787] => mysqli_stmt_bind_param
            [788] => mysqli_stmt_bind_result
            [789] => mysqli_stmt_close
            [790] => mysqli_stmt_data_seek
            [791] => mysqli_stmt_errno
            [792] => mysqli_stmt_error
            [793] => mysqli_stmt_error_list
            [794] => mysqli_stmt_fetch
            [795] => mysqli_stmt_field_count
            [796] => mysqli_stmt_free_result
            [797] => mysqli_stmt_get_result
            [798] => mysqli_stmt_get_warnings
            [799] => mysqli_stmt_init
            [800] => mysqli_stmt_insert_id
            [801] => mysqli_stmt_more_results
            [802] => mysqli_stmt_next_result
            [803] => mysqli_stmt_num_rows
            [804] => mysqli_stmt_param_count
            [805] => mysqli_stmt_prepare
            [806] => mysqli_stmt_reset
            [807] => mysqli_stmt_result_metadata
            [808] => mysqli_stmt_send_long_data
            [809] => mysqli_stmt_store_result
            [810] => mysqli_stmt_sqlstate
            [811] => mysqli_sqlstate
            [812] => mysqli_ssl_set
            [813] => mysqli_stat
            [814] => mysqli_store_result
            [815] => mysqli_thread_id
            [816] => mysqli_thread_safe
            [817] => mysqli_use_result
            [818] => mysqli_warning_count
            [819] => mysqli_refresh
            [820] => mysqli_escape_string
            [821] => mysqli_set_opt
            [822] => spl_classes
            [823] => spl_autoload
            [824] => spl_autoload_extensions
            [825] => spl_autoload_register
            [826] => spl_autoload_unregister
            [827] => spl_autoload_functions
            [828] => spl_autoload_call
            [829] => class_parents
            [830] => class_implements
            [831] => class_uses
            [832] => spl_object_hash
            [833] => iterator_to_array
            [834] => iterator_count
            [835] => iterator_apply
            [836] => pdo_drivers
            [837] => posix_kill
            [838] => posix_getpid
            [839] => posix_getppid
            [840] => posix_getuid
            [841] => posix_setuid
            [842] => posix_geteuid
            [843] => posix_seteuid
            [844] => posix_getgid
            [845] => posix_setgid
            [846] => posix_getegid
            [847] => posix_setegid
            [848] => posix_getgroups
            [849] => posix_getlogin
            [850] => posix_getpgrp
            [851] => posix_setsid
            [852] => posix_setpgid
            [853] => posix_getpgid
            [854] => posix_getsid
            [855] => posix_uname
            [856] => posix_times
            [857] => posix_ctermid
            [858] => posix_ttyname
            [859] => posix_isatty
            [860] => posix_getcwd
            [861] => posix_mkfifo
            [862] => posix_mknod
            [863] => posix_access
            [864] => posix_getgrnam
            [865] => posix_getgrgid
            [866] => posix_getpwnam
            [867] => posix_getpwuid
            [868] => posix_getrlimit
            [869] => posix_get_last_error
            [870] => posix_errno
            [871] => posix_strerror
            [872] => posix_initgroups
            [873] => session_name
            [874] => session_module_name
            [875] => session_save_path
            [876] => session_id
            [877] => session_regenerate_id
            [878] => session_decode
            [879] => session_encode
            [880] => session_start
            [881] => session_destroy
            [882] => session_unset
            [883] => session_set_save_handler
            [884] => session_cache_limiter
            [885] => session_cache_expire
            [886] => session_set_cookie_params
            [887] => session_get_cookie_params
            [888] => session_write_close
            [889] => session_abort
            [890] => session_reset
            [891] => session_status
            [892] => session_register_shutdown
            [893] => session_commit
            [894] => simplexml_load_file
            [895] => simplexml_load_string
            [896] => simplexml_import_dom
            [897] => use_soap_error_handler
            [898] => is_soap_fault
            [899] => socket_select
            [900] => socket_create
            [901] => socket_create_listen
            [902] => socket_create_pair
            [903] => socket_accept
            [904] => socket_set_nonblock
            [905] => socket_set_block
            [906] => socket_listen
            [907] => socket_close
            [908] => socket_write
            [909] => socket_read
            [910] => socket_getsockname
            [911] => socket_getpeername
            [912] => socket_connect
            [913] => socket_strerror
            [914] => socket_bind
            [915] => socket_recv
            [916] => socket_send
            [917] => socket_recvfrom
            [918] => socket_sendto
            [919] => socket_get_option
            [920] => socket_set_option
            [921] => socket_shutdown
            [922] => socket_last_error
            [923] => socket_clear_error
            [924] => socket_import_stream
            [925] => socket_sendmsg
            [926] => socket_recvmsg
            [927] => socket_cmsg_space
            [928] => socket_getopt
            [929] => socket_setopt
            [930] => constant
            [931] => bin2hex
            [932] => hex2bin
            [933] => sleep
            [934] => usleep
            [935] => time_nanosleep
            [936] => time_sleep_until
            [937] => strptime
            [938] => flush
            [939] => wordwrap
            [940] => htmlspecialchars
            [941] => htmlentities
            [942] => html_entity_decode
            [943] => htmlspecialchars_decode
            [944] => get_html_translation_table
            [945] => sha1
            [946] => sha1_file
            [947] => md5
            [948] => md5_file
            [949] => crc32
            [950] => iptcparse
            [951] => iptcembed
            [952] => getimagesize
            [953] => getimagesizefromstring
            [954] => image_type_to_mime_type
            [955] => image_type_to_extension
            [956] => phpinfo
            [957] => phpversion
            [958] => phpcredits
            [959] => php_sapi_name
            [960] => php_uname
            [961] => php_ini_scanned_files
            [962] => php_ini_loaded_file
            [963] => strnatcmp
            [964] => strnatcasecmp
            [965] => substr_count
            [966] => strspn
            [967] => strcspn
            [968] => strtok
            [969] => strtoupper
            [970] => strtolower
            [971] => strpos
            [972] => stripos
            [973] => strrpos
            [974] => strripos
            [975] => strrev
            [976] => hebrev
            [977] => hebrevc
            [978] => nl2br
            [979] => basename
            [980] => dirname
            [981] => pathinfo
            [982] => stripslashes
            [983] => stripcslashes
            [984] => strstr
            [985] => stristr
            [986] => strrchr
            [987] => str_shuffle
            [988] => str_word_count
            [989] => str_split
            [990] => strpbrk
            [991] => substr_compare
            [992] => strcoll
            [993] => money_format
            [994] => substr
            [995] => substr_replace
            [996] => quotemeta
            [997] => ucfirst
            [998] => lcfirst
            [999] => ucwords
            [1000] => strtr
            [1001] => addslashes
            [1002] => addcslashes
            [1003] => rtrim
            [1004] => str_replace
            [1005] => str_ireplace
            [1006] => str_repeat
            [1007] => count_chars
            [1008] => chunk_split
            [1009] => trim
            [1010] => ltrim
            [1011] => strip_tags
            [1012] => similar_text
            [1013] => explode
            [1014] => implode
            [1015] => join
            [1016] => setlocale
            [1017] => localeconv
            [1018] => nl_langinfo
            [1019] => soundex
            [1020] => levenshtein
            [1021] => chr
            [1022] => ord
            [1023] => parse_str
            [1024] => str_getcsv
            [1025] => str_pad
            [1026] => chop
            [1027] => strchr
            [1028] => sprintf
            [1029] => printf
            [1030] => vprintf
            [1031] => vsprintf
            [1032] => fprintf
            [1033] => vfprintf
            [1034] => sscanf
            [1035] => fscanf
            [1036] => parse_url
            [1037] => urlencode
            [1038] => urldecode
            [1039] => rawurlencode
            [1040] => rawurldecode
            [1041] => http_build_query
            [1042] => readlink
            [1043] => linkinfo
            [1044] => symlink
            [1045] => link
            [1046] => unlink
            [1047] => exec
            [1048] => system
            [1049] => escapeshellcmd
            [1050] => escapeshellarg
            [1051] => passthru
            [1052] => shell_exec
            [1053] => proc_open
            [1054] => proc_close
            [1055] => proc_terminate
            [1056] => proc_get_status
            [1057] => proc_nice
            [1058] => rand
            [1059] => srand
            [1060] => getrandmax
            [1061] => mt_rand
            [1062] => mt_srand
            [1063] => mt_getrandmax
            [1064] => getservbyname
            [1065] => getservbyport
            [1066] => getprotobyname
            [1067] => getprotobynumber
            [1068] => getmyuid
            [1069] => getmygid
            [1070] => getmypid
            [1071] => getmyinode
            [1072] => getlastmod
            [1073] => base64_decode
            [1074] => base64_encode
            [1075] => password_hash
            [1076] => password_get_info
            [1077] => password_needs_rehash
            [1078] => password_verify
            [1079] => convert_uuencode
            [1080] => convert_uudecode
            [1081] => abs
            [1082] => ceil
            [1083] => floor
            [1084] => round
            [1085] => sin
            [1086] => cos
            [1087] => tan
            [1088] => asin
            [1089] => acos
            [1090] => atan
            [1091] => atanh
            [1092] => atan2
            [1093] => sinh
            [1094] => cosh
            [1095] => tanh
            [1096] => asinh
            [1097] => acosh
            [1098] => expm1
            [1099] => log1p
            [1100] => pi
            [1101] => is_finite
            [1102] => is_nan
            [1103] => is_infinite
            [1104] => pow
            [1105] => exp
            [1106] => log
            [1107] => log10
            [1108] => sqrt
            [1109] => hypot
            [1110] => deg2rad
            [1111] => rad2deg
            [1112] => bindec
            [1113] => hexdec
            [1114] => octdec
            [1115] => decbin
            [1116] => decoct
            [1117] => dechex
            [1118] => base_convert
            [1119] => number_format
            [1120] => fmod
            [1121] => inet_ntop
            [1122] => inet_pton
            [1123] => ip2long
            [1124] => long2ip
            [1125] => getenv
            [1126] => putenv
            [1127] => getopt
            [1128] => sys_getloadavg
            [1129] => microtime
            [1130] => gettimeofday
            [1131] => getrusage
            [1132] => uniqid
            [1133] => quoted_printable_decode
            [1134] => quoted_printable_encode
            [1135] => convert_cyr_string
            [1136] => get_current_user
            [1137] => set_time_limit
            [1138] => header_register_callback
            [1139] => get_cfg_var
            [1140] => magic_quotes_runtime
            [1141] => set_magic_quotes_runtime
            [1142] => get_magic_quotes_gpc
            [1143] => get_magic_quotes_runtime
            [1144] => error_log
            [1145] => error_get_last
            [1146] => call_user_func
            [1147] => call_user_func_array
            [1148] => call_user_method
            [1149] => call_user_method_array
            [1150] => forward_static_call
            [1151] => forward_static_call_array
            [1152] => serialize
            [1153] => unserialize
            [1154] => var_dump
            [1155] => var_export
            [1156] => debug_zval_dump
            [1157] => print_r
            [1158] => memory_get_usage
            [1159] => memory_get_peak_usage
            [1160] => register_shutdown_function
            [1161] => register_tick_function
            [1162] => unregister_tick_function
            [1163] => highlight_file
            [1164] => show_source
            [1165] => highlight_string
            [1166] => php_strip_whitespace
            [1167] => ini_get
            [1168] => ini_get_all
            [1169] => ini_set
            [1170] => ini_alter
            [1171] => ini_restore
            [1172] => get_include_path
            [1173] => set_include_path
            [1174] => restore_include_path
            [1175] => setcookie
            [1176] => setrawcookie
            [1177] => header
            [1178] => header_remove
            [1179] => headers_sent
            [1180] => headers_list
            [1181] => http_response_code
            [1182] => connection_aborted
            [1183] => connection_status
            [1184] => ignore_user_abort
            [1185] => parse_ini_file
            [1186] => parse_ini_string
            [1187] => is_uploaded_file
            [1188] => move_uploaded_file
            [1189] => gethostbyaddr
            [1190] => gethostbyname
            [1191] => gethostbynamel
            [1192] => gethostname
            [1193] => dns_check_record
            [1194] => checkdnsrr
            [1195] => dns_get_mx
            [1196] => getmxrr
            [1197] => dns_get_record
            [1198] => intval
            [1199] => floatval
            [1200] => doubleval
            [1201] => strval
            [1202] => boolval
            [1203] => gettype
            [1204] => settype
            [1205] => is_null
            [1206] => is_resource
            [1207] => is_bool
            [1208] => is_long
            [1209] => is_float
            [1210] => is_int
            [1211] => is_integer
            [1212] => is_double
            [1213] => is_real
            [1214] => is_numeric
            [1215] => is_string
            [1216] => is_array
            [1217] => is_object
            [1218] => is_scalar
            [1219] => is_callable
            [1220] => pclose
            [1221] => popen
            [1222] => readfile
            [1223] => rewind
            [1224] => rmdir
            [1225] => umask
            [1226] => fclose
            [1227] => feof
            [1228] => fgetc
            [1229] => fgets
            [1230] => fgetss
            [1231] => fread
            [1232] => fopen
            [1233] => fpassthru
            [1234] => ftruncate
            [1235] => fstat
            [1236] => fseek
            [1237] => ftell
            [1238] => fflush
            [1239] => fwrite
            [1240] => fputs
            [1241] => mkdir
            [1242] => rename
            [1243] => copy
            [1244] => tempnam
            [1245] => tmpfile
            [1246] => file
            [1247] => file_get_contents
            [1248] => file_put_contents
            [1249] => stream_select
            [1250] => stream_context_create
            [1251] => stream_context_set_params
            [1252] => stream_context_get_params
            [1253] => stream_context_set_option
            [1254] => stream_context_get_options
            [1255] => stream_context_get_default
            [1256] => stream_context_set_default
            [1257] => stream_filter_prepend
            [1258] => stream_filter_append
            [1259] => stream_filter_remove
            [1260] => stream_socket_client
            [1261] => stream_socket_server
            [1262] => stream_socket_accept
            [1263] => stream_socket_get_name
            [1264] => stream_socket_recvfrom
            [1265] => stream_socket_sendto
            [1266] => stream_socket_enable_crypto
            [1267] => stream_socket_shutdown
            [1268] => stream_socket_pair
            [1269] => stream_copy_to_stream
            [1270] => stream_get_contents
            [1271] => stream_supports_lock
            [1272] => fgetcsv
            [1273] => fputcsv
            [1274] => flock
            [1275] => get_meta_tags
            [1276] => stream_set_read_buffer
            [1277] => stream_set_write_buffer
            [1278] => set_file_buffer
            [1279] => stream_set_chunk_size
            [1280] => set_socket_blocking
            [1281] => stream_set_blocking
            [1282] => socket_set_blocking
            [1283] => stream_get_meta_data
            [1284] => stream_get_line
            [1285] => stream_wrapper_register
            [1286] => stream_register_wrapper
            [1287] => stream_wrapper_unregister
            [1288] => stream_wrapper_restore
            [1289] => stream_get_wrappers
            [1290] => stream_get_transports
            [1291] => stream_resolve_include_path
            [1292] => stream_is_local
            [1293] => get_headers
            [1294] => stream_set_timeout
            [1295] => socket_set_timeout
            [1296] => socket_get_status
            [1297] => realpath
            [1298] => fnmatch
            [1299] => fsockopen
            [1300] => pfsockopen
            [1301] => pack
            [1302] => unpack
            [1303] => get_browser
            [1304] => crypt
            [1305] => opendir
            [1306] => closedir
            [1307] => chdir
            [1308] => getcwd
            [1309] => rewinddir
            [1310] => readdir
            [1311] => dir
            [1312] => scandir
            [1313] => glob
            [1314] => fileatime
            [1315] => filectime
            [1316] => filegroup
            [1317] => fileinode
            [1318] => filemtime
            [1319] => fileowner
            [1320] => fileperms
            [1321] => filesize
            [1322] => filetype
            [1323] => file_exists
            [1324] => is_writable
            [1325] => is_writeable
            [1326] => is_readable
            [1327] => is_executable
            [1328] => is_file
            [1329] => is_dir
            [1330] => is_link
            [1331] => stat
            [1332] => lstat
            [1333] => chown
            [1334] => chgrp
            [1335] => lchown
            [1336] => lchgrp
            [1337] => chmod
            [1338] => touch
            [1339] => clearstatcache
            [1340] => disk_total_space
            [1341] => disk_free_space
            [1342] => diskfreespace
            [1343] => realpath_cache_size
            [1344] => realpath_cache_get
            [1345] => mail
            [1346] => ezmlm_hash
            [1347] => openlog
            [1348] => syslog
            [1349] => closelog
            [1350] => lcg_value
            [1351] => metaphone
            [1352] => ob_start
            [1353] => ob_flush
            [1354] => ob_clean
            [1355] => ob_end_flush
            [1356] => ob_end_clean
            [1357] => ob_get_flush
            [1358] => ob_get_clean
            [1359] => ob_get_length
            [1360] => ob_get_level
            [1361] => ob_get_status
            [1362] => ob_get_contents
            [1363] => ob_implicit_flush
            [1364] => ob_list_handlers
            [1365] => ksort
            [1366] => krsort
            [1367] => natsort
            [1368] => natcasesort
            [1369] => asort
            [1370] => arsort
            [1371] => sort
            [1372] => rsort
            [1373] => usort
            [1374] => uasort
            [1375] => uksort
            [1376] => shuffle
            [1377] => array_walk
            [1378] => array_walk_recursive
            [1379] => count
            [1380] => end
            [1381] => prev
            [1382] => next
            [1383] => reset
            [1384] => current
            [1385] => key
            [1386] => min
            [1387] => max
            [1388] => in_array
            [1389] => array_search
            [1390] => extract
            [1391] => compact
            [1392] => array_fill
            [1393] => array_fill_keys
            [1394] => range
            [1395] => array_multisort
            [1396] => array_push
            [1397] => array_pop
            [1398] => array_shift
            [1399] => array_unshift
            [1400] => array_splice
            [1401] => array_slice
            [1402] => array_merge
            [1403] => array_merge_recursive
            [1404] => array_replace
            [1405] => array_replace_recursive
            [1406] => array_keys
            [1407] => array_values
            [1408] => array_count_values
            [1409] => array_column
            [1410] => array_reverse
            [1411] => array_reduce
            [1412] => array_pad
            [1413] => array_flip
            [1414] => array_change_key_case
            [1415] => array_rand
            [1416] => array_unique
            [1417] => array_intersect
            [1418] => array_intersect_key
            [1419] => array_intersect_ukey
            [1420] => array_uintersect
            [1421] => array_intersect_assoc
            [1422] => array_uintersect_assoc
            [1423] => array_intersect_uassoc
            [1424] => array_uintersect_uassoc
            [1425] => array_diff
            [1426] => array_diff_key
            [1427] => array_diff_ukey
            [1428] => array_udiff
            [1429] => array_diff_assoc
            [1430] => array_udiff_assoc
            [1431] => array_diff_uassoc
            [1432] => array_udiff_uassoc
            [1433] => array_sum
            [1434] => array_product
            [1435] => array_filter
            [1436] => array_map
            [1437] => array_chunk
            [1438] => array_combine
            [1439] => array_key_exists
            [1440] => pos
            [1441] => sizeof
            [1442] => key_exists
            [1443] => assert
            [1444] => assert_options
            [1445] => version_compare
            [1446] => ftok
            [1447] => str_rot13
            [1448] => stream_get_filters
            [1449] => stream_filter_register
            [1450] => stream_bucket_make_writeable
            [1451] => stream_bucket_prepend
            [1452] => stream_bucket_append
            [1453] => stream_bucket_new
            [1454] => output_add_rewrite_var
            [1455] => output_reset_rewrite_vars
            [1456] => sys_get_temp_dir
            [1457] => token_get_all
            [1458] => token_name
            [1459] => xml_parser_create
            [1460] => xml_parser_create_ns
            [1461] => xml_set_object
            [1462] => xml_set_element_handler
            [1463] => xml_set_character_data_handler
            [1464] => xml_set_processing_instruction_handler
            [1465] => xml_set_default_handler
            [1466] => xml_set_unparsed_entity_decl_handler
            [1467] => xml_set_notation_decl_handler
            [1468] => xml_set_external_entity_ref_handler
            [1469] => xml_set_start_namespace_decl_handler
            [1470] => xml_set_end_namespace_decl_handler
            [1471] => xml_parse
            [1472] => xml_parse_into_struct
            [1473] => xml_get_error_code
            [1474] => xml_error_string
            [1475] => xml_get_current_line_number
            [1476] => xml_get_current_column_number
            [1477] => xml_get_current_byte_index
            [1478] => xml_parser_free
            [1479] => xml_parser_set_option
            [1480] => xml_parser_get_option
            [1481] => utf8_encode
            [1482] => utf8_decode
            [1483] => xmlwriter_open_uri
            [1484] => xmlwriter_open_memory
            [1485] => xmlwriter_set_indent
            [1486] => xmlwriter_set_indent_string
            [1487] => xmlwriter_start_comment
            [1488] => xmlwriter_end_comment
            [1489] => xmlwriter_start_attribute
            [1490] => xmlwriter_end_attribute
            [1491] => xmlwriter_write_attribute
            [1492] => xmlwriter_start_attribute_ns
            [1493] => xmlwriter_write_attribute_ns
            [1494] => xmlwriter_start_element
            [1495] => xmlwriter_end_element
            [1496] => xmlwriter_full_end_element
            [1497] => xmlwriter_start_element_ns
            [1498] => xmlwriter_write_element
            [1499] => xmlwriter_write_element_ns
            [1500] => xmlwriter_start_pi
            [1501] => xmlwriter_end_pi
            [1502] => xmlwriter_write_pi
            [1503] => xmlwriter_start_cdata
            [1504] => xmlwriter_end_cdata
            [1505] => xmlwriter_write_cdata
            [1506] => xmlwriter_text
            [1507] => xmlwriter_write_raw
            [1508] => xmlwriter_start_document
            [1509] => xmlwriter_end_document
            [1510] => xmlwriter_write_comment
            [1511] => xmlwriter_start_dtd
            [1512] => xmlwriter_end_dtd
            [1513] => xmlwriter_write_dtd
            [1514] => xmlwriter_start_dtd_element
            [1515] => xmlwriter_end_dtd_element
            [1516] => xmlwriter_write_dtd_element
            [1517] => xmlwriter_start_dtd_attlist
            [1518] => xmlwriter_end_dtd_attlist
            [1519] => xmlwriter_write_dtd_attlist
            [1520] => xmlwriter_start_dtd_entity
            [1521] => xmlwriter_end_dtd_entity
            [1522] => xmlwriter_write_dtd_entity
            [1523] => xmlwriter_output_memory
            [1524] => xmlwriter_flush
            [1525] => zip_open
            [1526] => zip_close
            [1527] => zip_read
            [1528] => zip_entry_open
            [1529] => zip_entry_close
            [1530] => zip_entry_read
            [1531] => zip_entry_filesize
            [1532] => zip_entry_name
            [1533] => zip_entry_compressedsize
            [1534] => zip_entry_compressionmethod
            [1535] => apache_lookup_uri
            [1536] => virtual
            [1537] => apache_request_headers
            [1538] => apache_response_headers
            [1539] => apache_setenv
            [1540] => apache_getenv
            [1541] => apache_note
            [1542] => apache_get_version
            [1543] => apache_get_modules
            [1544] => getallheaders
        )

    [user] => Array
        (
            [0] => memory_usage
            [1] => microtime_float
            [2] => formatsize
            [3] => valid_email
            [4] => show
            [5] => isfun
            [6] => test_int
            [7] => test_float
            [8] => test_io
            [9] => sys_linux
            [10] => sys_freebsd
            [11] => get_key
            [12] => find_command
            [13] => do_command
            [14] => sys_windows
            [15] => getwmi
            [16] => bar
        )

)