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] => preg_match
            [116] => preg_match_all
            [117] => preg_replace
            [118] => preg_replace_callback
            [119] => preg_filter
            [120] => preg_split
            [121] => preg_quote
            [122] => preg_grep
            [123] => preg_last_error
            [124] => readgzfile
            [125] => gzrewind
            [126] => gzclose
            [127] => gzeof
            [128] => gzgetc
            [129] => gzgets
            [130] => gzgetss
            [131] => gzread
            [132] => gzopen
            [133] => gzpassthru
            [134] => gzseek
            [135] => gztell
            [136] => gzwrite
            [137] => gzputs
            [138] => gzfile
            [139] => gzcompress
            [140] => gzuncompress
            [141] => gzdeflate
            [142] => gzinflate
            [143] => gzencode
            [144] => gzdecode
            [145] => zlib_encode
            [146] => zlib_decode
            [147] => zlib_get_coding_type
            [148] => ob_gzhandler
            [149] => ctype_alnum
            [150] => ctype_alpha
            [151] => ctype_cntrl
            [152] => ctype_digit
            [153] => ctype_lower
            [154] => ctype_graph
            [155] => ctype_print
            [156] => ctype_punct
            [157] => ctype_space
            [158] => ctype_upper
            [159] => ctype_xdigit
            [160] => curl_init
            [161] => curl_copy_handle
            [162] => curl_version
            [163] => curl_setopt
            [164] => curl_setopt_array
            [165] => curl_exec
            [166] => curl_getinfo
            [167] => curl_error
            [168] => curl_errno
            [169] => curl_close
            [170] => curl_strerror
            [171] => curl_multi_strerror
            [172] => curl_reset
            [173] => curl_escape
            [174] => curl_unescape
            [175] => curl_pause
            [176] => curl_multi_init
            [177] => curl_multi_add_handle
            [178] => curl_multi_remove_handle
            [179] => curl_multi_select
            [180] => curl_multi_exec
            [181] => curl_multi_getcontent
            [182] => curl_multi_info_read
            [183] => curl_multi_close
            [184] => curl_multi_setopt
            [185] => curl_share_init
            [186] => curl_share_close
            [187] => curl_share_setopt
            [188] => curl_file_create
            [189] => dom_import_simplexml
            [190] => finfo_open
            [191] => finfo_close
            [192] => finfo_set_flags
            [193] => finfo_file
            [194] => finfo_buffer
            [195] => mime_content_type
            [196] => filter_input
            [197] => filter_var
            [198] => filter_input_array
            [199] => filter_var_array
            [200] => filter_list
            [201] => filter_has_var
            [202] => filter_id
            [203] => gd_info
            [204] => imagearc
            [205] => imageellipse
            [206] => imagechar
            [207] => imagecharup
            [208] => imagecolorat
            [209] => imagecolorallocate
            [210] => imagepalettecopy
            [211] => imagecreatefromstring
            [212] => imagecolorclosest
            [213] => imagecolorclosesthwb
            [214] => imagecolordeallocate
            [215] => imagecolorresolve
            [216] => imagecolorexact
            [217] => imagecolorset
            [218] => imagecolortransparent
            [219] => imagecolorstotal
            [220] => imagecolorsforindex
            [221] => imagecopy
            [222] => imagecopymerge
            [223] => imagecopymergegray
            [224] => imagecopyresized
            [225] => imagecreate
            [226] => imagecreatetruecolor
            [227] => imageistruecolor
            [228] => imagetruecolortopalette
            [229] => imagepalettetotruecolor
            [230] => imagesetthickness
            [231] => imagefilledarc
            [232] => imagefilledellipse
            [233] => imagealphablending
            [234] => imagesavealpha
            [235] => imagecolorallocatealpha
            [236] => imagecolorresolvealpha
            [237] => imagecolorclosestalpha
            [238] => imagecolorexactalpha
            [239] => imagecopyresampled
            [240] => imagerotate
            [241] => imageflip
            [242] => imageantialias
            [243] => imagecrop
            [244] => imagecropauto
            [245] => imagescale
            [246] => imageaffine
            [247] => imageaffinematrixconcat
            [248] => imageaffinematrixget
            [249] => imagesetinterpolation
            [250] => imagesettile
            [251] => imagesetbrush
            [252] => imagesetstyle
            [253] => imagecreatefrompng
            [254] => imagecreatefromgif
            [255] => imagecreatefromwbmp
            [256] => imagecreatefromxbm
            [257] => imagecreatefromgd
            [258] => imagecreatefromgd2
            [259] => imagecreatefromgd2part
            [260] => imagepng
            [261] => imagegif
            [262] => imagewbmp
            [263] => imagegd
            [264] => imagegd2
            [265] => imagedestroy
            [266] => imagegammacorrect
            [267] => imagefill
            [268] => imagefilledpolygon
            [269] => imagefilledrectangle
            [270] => imagefilltoborder
            [271] => imagefontwidth
            [272] => imagefontheight
            [273] => imageinterlace
            [274] => imageline
            [275] => imageloadfont
            [276] => imagepolygon
            [277] => imagerectangle
            [278] => imagesetpixel
            [279] => imagestring
            [280] => imagestringup
            [281] => imagesx
            [282] => imagesy
            [283] => imagedashedline
            [284] => imagetypes
            [285] => png2wbmp
            [286] => image2wbmp
            [287] => imagelayereffect
            [288] => imagexbm
            [289] => imagecolormatch
            [290] => imagefilter
            [291] => imageconvolution
            [292] => hash
            [293] => hash_file
            [294] => hash_hmac
            [295] => hash_hmac_file
            [296] => hash_init
            [297] => hash_update
            [298] => hash_update_stream
            [299] => hash_update_file
            [300] => hash_final
            [301] => hash_copy
            [302] => hash_algos
            [303] => hash_pbkdf2
            [304] => iconv
            [305] => iconv_get_encoding
            [306] => iconv_set_encoding
            [307] => iconv_strlen
            [308] => iconv_substr
            [309] => iconv_strpos
            [310] => iconv_strrpos
            [311] => iconv_mime_encode
            [312] => iconv_mime_decode
            [313] => iconv_mime_decode_headers
            [314] => json_encode
            [315] => json_decode
            [316] => json_last_error
            [317] => json_last_error_msg
            [318] => mb_convert_case
            [319] => mb_strtoupper
            [320] => mb_strtolower
            [321] => mb_language
            [322] => mb_internal_encoding
            [323] => mb_http_input
            [324] => mb_http_output
            [325] => mb_detect_order
            [326] => mb_substitute_character
            [327] => mb_parse_str
            [328] => mb_output_handler
            [329] => mb_preferred_mime_name
            [330] => mb_strlen
            [331] => mb_strpos
            [332] => mb_strrpos
            [333] => mb_stripos
            [334] => mb_strripos
            [335] => mb_strstr
            [336] => mb_strrchr
            [337] => mb_stristr
            [338] => mb_strrichr
            [339] => mb_substr_count
            [340] => mb_substr
            [341] => mb_strcut
            [342] => mb_strwidth
            [343] => mb_strimwidth
            [344] => mb_convert_encoding
            [345] => mb_detect_encoding
            [346] => mb_list_encodings
            [347] => mb_encoding_aliases
            [348] => mb_convert_kana
            [349] => mb_encode_mimeheader
            [350] => mb_decode_mimeheader
            [351] => mb_convert_variables
            [352] => mb_encode_numericentity
            [353] => mb_decode_numericentity
            [354] => mb_send_mail
            [355] => mb_get_info
            [356] => mb_check_encoding
            [357] => mb_regex_encoding
            [358] => mb_regex_set_options
            [359] => mb_ereg
            [360] => mb_eregi
            [361] => mb_ereg_replace
            [362] => mb_eregi_replace
            [363] => mb_ereg_replace_callback
            [364] => mb_split
            [365] => mb_ereg_match
            [366] => mb_ereg_search
            [367] => mb_ereg_search_pos
            [368] => mb_ereg_search_regs
            [369] => mb_ereg_search_init
            [370] => mb_ereg_search_getregs
            [371] => mb_ereg_search_getpos
            [372] => mb_ereg_search_setpos
            [373] => mbregex_encoding
            [374] => mbereg
            [375] => mberegi
            [376] => mbereg_replace
            [377] => mberegi_replace
            [378] => mbsplit
            [379] => mbereg_match
            [380] => mbereg_search
            [381] => mbereg_search_pos
            [382] => mbereg_search_regs
            [383] => mbereg_search_init
            [384] => mbereg_search_getregs
            [385] => mbereg_search_getpos
            [386] => mbereg_search_setpos
            [387] => mysql_connect
            [388] => mysql_pconnect
            [389] => mysql_close
            [390] => mysql_select_db
            [391] => mysql_query
            [392] => mysql_unbuffered_query
            [393] => mysql_db_query
            [394] => mysql_list_dbs
            [395] => mysql_list_tables
            [396] => mysql_list_fields
            [397] => mysql_list_processes
            [398] => mysql_error
            [399] => mysql_errno
            [400] => mysql_affected_rows
            [401] => mysql_insert_id
            [402] => mysql_result
            [403] => mysql_num_rows
            [404] => mysql_num_fields
            [405] => mysql_fetch_row
            [406] => mysql_fetch_array
            [407] => mysql_fetch_assoc
            [408] => mysql_fetch_object
            [409] => mysql_data_seek
            [410] => mysql_fetch_lengths
            [411] => mysql_fetch_field
            [412] => mysql_field_seek
            [413] => mysql_free_result
            [414] => mysql_field_name
            [415] => mysql_field_table
            [416] => mysql_field_len
            [417] => mysql_field_type
            [418] => mysql_field_flags
            [419] => mysql_escape_string
            [420] => mysql_real_escape_string
            [421] => mysql_stat
            [422] => mysql_thread_id
            [423] => mysql_client_encoding
            [424] => mysql_ping
            [425] => mysql_get_client_info
            [426] => mysql_get_host_info
            [427] => mysql_get_proto_info
            [428] => mysql_get_server_info
            [429] => mysql_info
            [430] => mysql_set_charset
            [431] => mysql
            [432] => mysql_fieldname
            [433] => mysql_fieldtable
            [434] => mysql_fieldlen
            [435] => mysql_fieldtype
            [436] => mysql_fieldflags
            [437] => mysql_selectdb
            [438] => mysql_freeresult
            [439] => mysql_numfields
            [440] => mysql_numrows
            [441] => mysql_listdbs
            [442] => mysql_listtables
            [443] => mysql_listfields
            [444] => mysql_db_name
            [445] => mysql_dbname
            [446] => mysql_tablename
            [447] => mysql_table_name
            [448] => mysqli_affected_rows
            [449] => mysqli_autocommit
            [450] => mysqli_begin_transaction
            [451] => mysqli_change_user
            [452] => mysqli_character_set_name
            [453] => mysqli_close
            [454] => mysqli_commit
            [455] => mysqli_connect
            [456] => mysqli_connect_errno
            [457] => mysqli_connect_error
            [458] => mysqli_data_seek
            [459] => mysqli_dump_debug_info
            [460] => mysqli_debug
            [461] => mysqli_errno
            [462] => mysqli_error
            [463] => mysqli_error_list
            [464] => mysqli_stmt_execute
            [465] => mysqli_execute
            [466] => mysqli_fetch_field
            [467] => mysqli_fetch_fields
            [468] => mysqli_fetch_field_direct
            [469] => mysqli_fetch_lengths
            [470] => mysqli_fetch_all
            [471] => mysqli_fetch_array
            [472] => mysqli_fetch_assoc
            [473] => mysqli_fetch_object
            [474] => mysqli_fetch_row
            [475] => mysqli_field_count
            [476] => mysqli_field_seek
            [477] => mysqli_field_tell
            [478] => mysqli_free_result
            [479] => mysqli_get_connection_stats
            [480] => mysqli_get_client_stats
            [481] => mysqli_get_charset
            [482] => mysqli_get_client_info
            [483] => mysqli_get_client_version
            [484] => mysqli_get_host_info
            [485] => mysqli_get_proto_info
            [486] => mysqli_get_server_info
            [487] => mysqli_get_server_version
            [488] => mysqli_get_warnings
            [489] => mysqli_init
            [490] => mysqli_info
            [491] => mysqli_insert_id
            [492] => mysqli_kill
            [493] => mysqli_more_results
            [494] => mysqli_multi_query
            [495] => mysqli_next_result
            [496] => mysqli_num_fields
            [497] => mysqli_num_rows
            [498] => mysqli_options
            [499] => mysqli_ping
            [500] => mysqli_poll
            [501] => mysqli_prepare
            [502] => mysqli_report
            [503] => mysqli_query
            [504] => mysqli_real_connect
            [505] => mysqli_real_escape_string
            [506] => mysqli_real_query
            [507] => mysqli_reap_async_query
            [508] => mysqli_release_savepoint
            [509] => mysqli_rollback
            [510] => mysqli_savepoint
            [511] => mysqli_select_db
            [512] => mysqli_set_charset
            [513] => mysqli_stmt_affected_rows
            [514] => mysqli_stmt_attr_get
            [515] => mysqli_stmt_attr_set
            [516] => mysqli_stmt_bind_param
            [517] => mysqli_stmt_bind_result
            [518] => mysqli_stmt_close
            [519] => mysqli_stmt_data_seek
            [520] => mysqli_stmt_errno
            [521] => mysqli_stmt_error
            [522] => mysqli_stmt_error_list
            [523] => mysqli_stmt_fetch
            [524] => mysqli_stmt_field_count
            [525] => mysqli_stmt_free_result
            [526] => mysqli_stmt_get_result
            [527] => mysqli_stmt_get_warnings
            [528] => mysqli_stmt_init
            [529] => mysqli_stmt_insert_id
            [530] => mysqli_stmt_more_results
            [531] => mysqli_stmt_next_result
            [532] => mysqli_stmt_num_rows
            [533] => mysqli_stmt_param_count
            [534] => mysqli_stmt_prepare
            [535] => mysqli_stmt_reset
            [536] => mysqli_stmt_result_metadata
            [537] => mysqli_stmt_send_long_data
            [538] => mysqli_stmt_store_result
            [539] => mysqli_stmt_sqlstate
            [540] => mysqli_sqlstate
            [541] => mysqli_ssl_set
            [542] => mysqli_stat
            [543] => mysqli_store_result
            [544] => mysqli_thread_id
            [545] => mysqli_thread_safe
            [546] => mysqli_use_result
            [547] => mysqli_warning_count
            [548] => mysqli_refresh
            [549] => mysqli_escape_string
            [550] => mysqli_set_opt
            [551] => spl_classes
            [552] => spl_autoload
            [553] => spl_autoload_extensions
            [554] => spl_autoload_register
            [555] => spl_autoload_unregister
            [556] => spl_autoload_functions
            [557] => spl_autoload_call
            [558] => class_parents
            [559] => class_implements
            [560] => class_uses
            [561] => spl_object_hash
            [562] => iterator_to_array
            [563] => iterator_count
            [564] => iterator_apply
            [565] => pdo_drivers
            [566] => posix_kill
            [567] => posix_getpid
            [568] => posix_getppid
            [569] => posix_getuid
            [570] => posix_setuid
            [571] => posix_geteuid
            [572] => posix_seteuid
            [573] => posix_getgid
            [574] => posix_setgid
            [575] => posix_getegid
            [576] => posix_setegid
            [577] => posix_getgroups
            [578] => posix_getlogin
            [579] => posix_getpgrp
            [580] => posix_setsid
            [581] => posix_setpgid
            [582] => posix_getpgid
            [583] => posix_getsid
            [584] => posix_uname
            [585] => posix_times
            [586] => posix_ctermid
            [587] => posix_ttyname
            [588] => posix_isatty
            [589] => posix_getcwd
            [590] => posix_mkfifo
            [591] => posix_mknod
            [592] => posix_access
            [593] => posix_getgrnam
            [594] => posix_getgrgid
            [595] => posix_getpwnam
            [596] => posix_getpwuid
            [597] => posix_getrlimit
            [598] => posix_get_last_error
            [599] => posix_errno
            [600] => posix_strerror
            [601] => posix_initgroups
            [602] => session_name
            [603] => session_module_name
            [604] => session_save_path
            [605] => session_id
            [606] => session_regenerate_id
            [607] => session_decode
            [608] => session_encode
            [609] => session_start
            [610] => session_destroy
            [611] => session_unset
            [612] => session_set_save_handler
            [613] => session_cache_limiter
            [614] => session_cache_expire
            [615] => session_set_cookie_params
            [616] => session_get_cookie_params
            [617] => session_write_close
            [618] => session_status
            [619] => session_register_shutdown
            [620] => session_commit
            [621] => simplexml_load_file
            [622] => simplexml_load_string
            [623] => simplexml_import_dom
            [624] => constant
            [625] => bin2hex
            [626] => hex2bin
            [627] => sleep
            [628] => usleep
            [629] => time_nanosleep
            [630] => time_sleep_until
            [631] => strptime
            [632] => flush
            [633] => wordwrap
            [634] => htmlspecialchars
            [635] => htmlentities
            [636] => html_entity_decode
            [637] => htmlspecialchars_decode
            [638] => get_html_translation_table
            [639] => sha1
            [640] => sha1_file
            [641] => md5
            [642] => md5_file
            [643] => crc32
            [644] => iptcparse
            [645] => iptcembed
            [646] => getimagesize
            [647] => getimagesizefromstring
            [648] => image_type_to_mime_type
            [649] => image_type_to_extension
            [650] => phpinfo
            [651] => phpversion
            [652] => phpcredits
            [653] => php_sapi_name
            [654] => php_uname
            [655] => php_ini_scanned_files
            [656] => php_ini_loaded_file
            [657] => strnatcmp
            [658] => strnatcasecmp
            [659] => substr_count
            [660] => strspn
            [661] => strcspn
            [662] => strtok
            [663] => strtoupper
            [664] => strtolower
            [665] => strpos
            [666] => stripos
            [667] => strrpos
            [668] => strripos
            [669] => strrev
            [670] => hebrev
            [671] => hebrevc
            [672] => nl2br
            [673] => basename
            [674] => dirname
            [675] => pathinfo
            [676] => stripslashes
            [677] => stripcslashes
            [678] => strstr
            [679] => stristr
            [680] => strrchr
            [681] => str_shuffle
            [682] => str_word_count
            [683] => str_split
            [684] => strpbrk
            [685] => substr_compare
            [686] => strcoll
            [687] => money_format
            [688] => substr
            [689] => substr_replace
            [690] => quotemeta
            [691] => ucfirst
            [692] => lcfirst
            [693] => ucwords
            [694] => strtr
            [695] => addslashes
            [696] => addcslashes
            [697] => rtrim
            [698] => str_replace
            [699] => str_ireplace
            [700] => str_repeat
            [701] => count_chars
            [702] => chunk_split
            [703] => trim
            [704] => ltrim
            [705] => strip_tags
            [706] => similar_text
            [707] => explode
            [708] => implode
            [709] => join
            [710] => setlocale
            [711] => localeconv
            [712] => nl_langinfo
            [713] => soundex
            [714] => levenshtein
            [715] => chr
            [716] => ord
            [717] => parse_str
            [718] => str_getcsv
            [719] => str_pad
            [720] => chop
            [721] => strchr
            [722] => sprintf
            [723] => printf
            [724] => vprintf
            [725] => vsprintf
            [726] => fprintf
            [727] => vfprintf
            [728] => sscanf
            [729] => fscanf
            [730] => parse_url
            [731] => urlencode
            [732] => urldecode
            [733] => rawurlencode
            [734] => rawurldecode
            [735] => http_build_query
            [736] => readlink
            [737] => linkinfo
            [738] => symlink
            [739] => link
            [740] => unlink
            [741] => exec
            [742] => system
            [743] => escapeshellcmd
            [744] => escapeshellarg
            [745] => passthru
            [746] => shell_exec
            [747] => proc_open
            [748] => proc_close
            [749] => proc_terminate
            [750] => proc_get_status
            [751] => proc_nice
            [752] => rand
            [753] => srand
            [754] => getrandmax
            [755] => mt_rand
            [756] => mt_srand
            [757] => mt_getrandmax
            [758] => getservbyname
            [759] => getservbyport
            [760] => getprotobyname
            [761] => getprotobynumber
            [762] => getmyuid
            [763] => getmygid
            [764] => getmypid
            [765] => getmyinode
            [766] => getlastmod
            [767] => base64_decode
            [768] => base64_encode
            [769] => password_hash
            [770] => password_get_info
            [771] => password_needs_rehash
            [772] => password_verify
            [773] => convert_uuencode
            [774] => convert_uudecode
            [775] => abs
            [776] => ceil
            [777] => floor
            [778] => round
            [779] => sin
            [780] => cos
            [781] => tan
            [782] => asin
            [783] => acos
            [784] => atan
            [785] => atanh
            [786] => atan2
            [787] => sinh
            [788] => cosh
            [789] => tanh
            [790] => asinh
            [791] => acosh
            [792] => expm1
            [793] => log1p
            [794] => pi
            [795] => is_finite
            [796] => is_nan
            [797] => is_infinite
            [798] => pow
            [799] => exp
            [800] => log
            [801] => log10
            [802] => sqrt
            [803] => hypot
            [804] => deg2rad
            [805] => rad2deg
            [806] => bindec
            [807] => hexdec
            [808] => octdec
            [809] => decbin
            [810] => decoct
            [811] => dechex
            [812] => base_convert
            [813] => number_format
            [814] => fmod
            [815] => inet_ntop
            [816] => inet_pton
            [817] => ip2long
            [818] => long2ip
            [819] => getenv
            [820] => putenv
            [821] => getopt
            [822] => sys_getloadavg
            [823] => microtime
            [824] => gettimeofday
            [825] => getrusage
            [826] => uniqid
            [827] => quoted_printable_decode
            [828] => quoted_printable_encode
            [829] => convert_cyr_string
            [830] => get_current_user
            [831] => set_time_limit
            [832] => header_register_callback
            [833] => get_cfg_var
            [834] => magic_quotes_runtime
            [835] => set_magic_quotes_runtime
            [836] => get_magic_quotes_gpc
            [837] => get_magic_quotes_runtime
            [838] => error_log
            [839] => error_get_last
            [840] => call_user_func
            [841] => call_user_func_array
            [842] => call_user_method
            [843] => call_user_method_array
            [844] => forward_static_call
            [845] => forward_static_call_array
            [846] => serialize
            [847] => unserialize
            [848] => var_dump
            [849] => var_export
            [850] => debug_zval_dump
            [851] => print_r
            [852] => memory_get_usage
            [853] => memory_get_peak_usage
            [854] => register_shutdown_function
            [855] => register_tick_function
            [856] => unregister_tick_function
            [857] => highlight_file
            [858] => show_source
            [859] => highlight_string
            [860] => php_strip_whitespace
            [861] => ini_get
            [862] => ini_get_all
            [863] => ini_set
            [864] => ini_alter
            [865] => ini_restore
            [866] => get_include_path
            [867] => set_include_path
            [868] => restore_include_path
            [869] => setcookie
            [870] => setrawcookie
            [871] => header
            [872] => header_remove
            [873] => headers_sent
            [874] => headers_list
            [875] => http_response_code
            [876] => connection_aborted
            [877] => connection_status
            [878] => ignore_user_abort
            [879] => parse_ini_file
            [880] => parse_ini_string
            [881] => is_uploaded_file
            [882] => move_uploaded_file
            [883] => gethostbyaddr
            [884] => gethostbyname
            [885] => gethostbynamel
            [886] => gethostname
            [887] => dns_check_record
            [888] => checkdnsrr
            [889] => dns_get_mx
            [890] => getmxrr
            [891] => dns_get_record
            [892] => intval
            [893] => floatval
            [894] => doubleval
            [895] => strval
            [896] => boolval
            [897] => gettype
            [898] => settype
            [899] => is_null
            [900] => is_resource
            [901] => is_bool
            [902] => is_long
            [903] => is_float
            [904] => is_int
            [905] => is_integer
            [906] => is_double
            [907] => is_real
            [908] => is_numeric
            [909] => is_string
            [910] => is_array
            [911] => is_object
            [912] => is_scalar
            [913] => is_callable
            [914] => pclose
            [915] => popen
            [916] => readfile
            [917] => rewind
            [918] => rmdir
            [919] => umask
            [920] => fclose
            [921] => feof
            [922] => fgetc
            [923] => fgets
            [924] => fgetss
            [925] => fread
            [926] => fopen
            [927] => fpassthru
            [928] => ftruncate
            [929] => fstat
            [930] => fseek
            [931] => ftell
            [932] => fflush
            [933] => fwrite
            [934] => fputs
            [935] => mkdir
            [936] => rename
            [937] => copy
            [938] => tempnam
            [939] => tmpfile
            [940] => file
            [941] => file_get_contents
            [942] => file_put_contents
            [943] => stream_select
            [944] => stream_context_create
            [945] => stream_context_set_params
            [946] => stream_context_get_params
            [947] => stream_context_set_option
            [948] => stream_context_get_options
            [949] => stream_context_get_default
            [950] => stream_context_set_default
            [951] => stream_filter_prepend
            [952] => stream_filter_append
            [953] => stream_filter_remove
            [954] => stream_socket_client
            [955] => stream_socket_server
            [956] => stream_socket_accept
            [957] => stream_socket_get_name
            [958] => stream_socket_recvfrom
            [959] => stream_socket_sendto
            [960] => stream_socket_enable_crypto
            [961] => stream_socket_shutdown
            [962] => stream_socket_pair
            [963] => stream_copy_to_stream
            [964] => stream_get_contents
            [965] => stream_supports_lock
            [966] => fgetcsv
            [967] => fputcsv
            [968] => flock
            [969] => get_meta_tags
            [970] => stream_set_read_buffer
            [971] => stream_set_write_buffer
            [972] => set_file_buffer
            [973] => stream_set_chunk_size
            [974] => set_socket_blocking
            [975] => stream_set_blocking
            [976] => socket_set_blocking
            [977] => stream_get_meta_data
            [978] => stream_get_line
            [979] => stream_wrapper_register
            [980] => stream_register_wrapper
            [981] => stream_wrapper_unregister
            [982] => stream_wrapper_restore
            [983] => stream_get_wrappers
            [984] => stream_get_transports
            [985] => stream_resolve_include_path
            [986] => stream_is_local
            [987] => get_headers
            [988] => stream_set_timeout
            [989] => socket_set_timeout
            [990] => socket_get_status
            [991] => realpath
            [992] => fnmatch
            [993] => fsockopen
            [994] => pfsockopen
            [995] => pack
            [996] => unpack
            [997] => get_browser
            [998] => crypt
            [999] => opendir
            [1000] => closedir
            [1001] => chdir
            [1002] => getcwd
            [1003] => rewinddir
            [1004] => readdir
            [1005] => dir
            [1006] => scandir
            [1007] => glob
            [1008] => fileatime
            [1009] => filectime
            [1010] => filegroup
            [1011] => fileinode
            [1012] => filemtime
            [1013] => fileowner
            [1014] => fileperms
            [1015] => filesize
            [1016] => filetype
            [1017] => file_exists
            [1018] => is_writable
            [1019] => is_writeable
            [1020] => is_readable
            [1021] => is_executable
            [1022] => is_file
            [1023] => is_dir
            [1024] => is_link
            [1025] => stat
            [1026] => lstat
            [1027] => chown
            [1028] => chgrp
            [1029] => lchown
            [1030] => lchgrp
            [1031] => chmod
            [1032] => touch
            [1033] => clearstatcache
            [1034] => disk_total_space
            [1035] => disk_free_space
            [1036] => diskfreespace
            [1037] => realpath_cache_size
            [1038] => realpath_cache_get
            [1039] => mail
            [1040] => ezmlm_hash
            [1041] => openlog
            [1042] => syslog
            [1043] => closelog
            [1044] => lcg_value
            [1045] => metaphone
            [1046] => ob_start
            [1047] => ob_flush
            [1048] => ob_clean
            [1049] => ob_end_flush
            [1050] => ob_end_clean
            [1051] => ob_get_flush
            [1052] => ob_get_clean
            [1053] => ob_get_length
            [1054] => ob_get_level
            [1055] => ob_get_status
            [1056] => ob_get_contents
            [1057] => ob_implicit_flush
            [1058] => ob_list_handlers
            [1059] => ksort
            [1060] => krsort
            [1061] => natsort
            [1062] => natcasesort
            [1063] => asort
            [1064] => arsort
            [1065] => sort
            [1066] => rsort
            [1067] => usort
            [1068] => uasort
            [1069] => uksort
            [1070] => shuffle
            [1071] => array_walk
            [1072] => array_walk_recursive
            [1073] => count
            [1074] => end
            [1075] => prev
            [1076] => next
            [1077] => reset
            [1078] => current
            [1079] => key
            [1080] => min
            [1081] => max
            [1082] => in_array
            [1083] => array_search
            [1084] => extract
            [1085] => compact
            [1086] => array_fill
            [1087] => array_fill_keys
            [1088] => range
            [1089] => array_multisort
            [1090] => array_push
            [1091] => array_pop
            [1092] => array_shift
            [1093] => array_unshift
            [1094] => array_splice
            [1095] => array_slice
            [1096] => array_merge
            [1097] => array_merge_recursive
            [1098] => array_replace
            [1099] => array_replace_recursive
            [1100] => array_keys
            [1101] => array_values
            [1102] => array_count_values
            [1103] => array_column
            [1104] => array_reverse
            [1105] => array_reduce
            [1106] => array_pad
            [1107] => array_flip
            [1108] => array_change_key_case
            [1109] => array_rand
            [1110] => array_unique
            [1111] => array_intersect
            [1112] => array_intersect_key
            [1113] => array_intersect_ukey
            [1114] => array_uintersect
            [1115] => array_intersect_assoc
            [1116] => array_uintersect_assoc
            [1117] => array_intersect_uassoc
            [1118] => array_uintersect_uassoc
            [1119] => array_diff
            [1120] => array_diff_key
            [1121] => array_diff_ukey
            [1122] => array_udiff
            [1123] => array_diff_assoc
            [1124] => array_udiff_assoc
            [1125] => array_diff_uassoc
            [1126] => array_udiff_uassoc
            [1127] => array_sum
            [1128] => array_product
            [1129] => array_filter
            [1130] => array_map
            [1131] => array_chunk
            [1132] => array_combine
            [1133] => array_key_exists
            [1134] => pos
            [1135] => sizeof
            [1136] => key_exists
            [1137] => assert
            [1138] => assert_options
            [1139] => version_compare
            [1140] => ftok
            [1141] => str_rot13
            [1142] => stream_get_filters
            [1143] => stream_filter_register
            [1144] => stream_bucket_make_writeable
            [1145] => stream_bucket_prepend
            [1146] => stream_bucket_append
            [1147] => stream_bucket_new
            [1148] => output_add_rewrite_var
            [1149] => output_reset_rewrite_vars
            [1150] => sys_get_temp_dir
            [1151] => token_get_all
            [1152] => token_name
            [1153] => xml_parser_create
            [1154] => xml_parser_create_ns
            [1155] => xml_set_object
            [1156] => xml_set_element_handler
            [1157] => xml_set_character_data_handler
            [1158] => xml_set_processing_instruction_handler
            [1159] => xml_set_default_handler
            [1160] => xml_set_unparsed_entity_decl_handler
            [1161] => xml_set_notation_decl_handler
            [1162] => xml_set_external_entity_ref_handler
            [1163] => xml_set_start_namespace_decl_handler
            [1164] => xml_set_end_namespace_decl_handler
            [1165] => xml_parse
            [1166] => xml_parse_into_struct
            [1167] => xml_get_error_code
            [1168] => xml_error_string
            [1169] => xml_get_current_line_number
            [1170] => xml_get_current_column_number
            [1171] => xml_get_current_byte_index
            [1172] => xml_parser_free
            [1173] => xml_parser_set_option
            [1174] => xml_parser_get_option
            [1175] => utf8_encode
            [1176] => utf8_decode
            [1177] => xmlwriter_open_uri
            [1178] => xmlwriter_open_memory
            [1179] => xmlwriter_set_indent
            [1180] => xmlwriter_set_indent_string
            [1181] => xmlwriter_start_comment
            [1182] => xmlwriter_end_comment
            [1183] => xmlwriter_start_attribute
            [1184] => xmlwriter_end_attribute
            [1185] => xmlwriter_write_attribute
            [1186] => xmlwriter_start_attribute_ns
            [1187] => xmlwriter_write_attribute_ns
            [1188] => xmlwriter_start_element
            [1189] => xmlwriter_end_element
            [1190] => xmlwriter_full_end_element
            [1191] => xmlwriter_start_element_ns
            [1192] => xmlwriter_write_element
            [1193] => xmlwriter_write_element_ns
            [1194] => xmlwriter_start_pi
            [1195] => xmlwriter_end_pi
            [1196] => xmlwriter_write_pi
            [1197] => xmlwriter_start_cdata
            [1198] => xmlwriter_end_cdata
            [1199] => xmlwriter_write_cdata
            [1200] => xmlwriter_text
            [1201] => xmlwriter_write_raw
            [1202] => xmlwriter_start_document
            [1203] => xmlwriter_end_document
            [1204] => xmlwriter_write_comment
            [1205] => xmlwriter_start_dtd
            [1206] => xmlwriter_end_dtd
            [1207] => xmlwriter_write_dtd
            [1208] => xmlwriter_start_dtd_element
            [1209] => xmlwriter_end_dtd_element
            [1210] => xmlwriter_write_dtd_element
            [1211] => xmlwriter_start_dtd_attlist
            [1212] => xmlwriter_end_dtd_attlist
            [1213] => xmlwriter_write_dtd_attlist
            [1214] => xmlwriter_start_dtd_entity
            [1215] => xmlwriter_end_dtd_entity
            [1216] => xmlwriter_write_dtd_entity
            [1217] => xmlwriter_output_memory
            [1218] => xmlwriter_flush
            [1219] => apache_lookup_uri
            [1220] => virtual
            [1221] => apache_request_headers
            [1222] => apache_response_headers
            [1223] => apache_setenv
            [1224] => apache_getenv
            [1225] => apache_note
            [1226] => apache_get_version
            [1227] => apache_get_modules
            [1228] => getallheaders
            [1229] => memcache_connect
            [1230] => memcache_pconnect
            [1231] => memcache_add_server
            [1232] => memcache_set_server_params
            [1233] => memcache_set_failure_callback
            [1234] => memcache_get_server_status
            [1235] => memcache_get_version
            [1236] => memcache_add
            [1237] => memcache_set
            [1238] => memcache_replace
            [1239] => memcache_cas
            [1240] => memcache_append
            [1241] => memcache_prepend
            [1242] => memcache_get
            [1243] => memcache_delete
            [1244] => memcache_debug
            [1245] => memcache_get_stats
            [1246] => memcache_get_extended_stats
            [1247] => memcache_set_compress_threshold
            [1248] => memcache_increment
            [1249] => memcache_decrement
            [1250] => memcache_close
            [1251] => memcache_flush
            [1252] => openssl_pkey_free
            [1253] => openssl_pkey_new
            [1254] => openssl_pkey_export
            [1255] => openssl_pkey_export_to_file
            [1256] => openssl_pkey_get_private
            [1257] => openssl_pkey_get_public
            [1258] => openssl_pkey_get_details
            [1259] => openssl_free_key
            [1260] => openssl_get_privatekey
            [1261] => openssl_get_publickey
            [1262] => openssl_x509_read
            [1263] => openssl_x509_free
            [1264] => openssl_x509_parse
            [1265] => openssl_x509_checkpurpose
            [1266] => openssl_x509_check_private_key
            [1267] => openssl_x509_export
            [1268] => openssl_x509_export_to_file
            [1269] => openssl_pkcs12_export
            [1270] => openssl_pkcs12_export_to_file
            [1271] => openssl_pkcs12_read
            [1272] => openssl_csr_new
            [1273] => openssl_csr_export
            [1274] => openssl_csr_export_to_file
            [1275] => openssl_csr_sign
            [1276] => openssl_csr_get_subject
            [1277] => openssl_csr_get_public_key
            [1278] => openssl_digest
            [1279] => openssl_encrypt
            [1280] => openssl_decrypt
            [1281] => openssl_cipher_iv_length
            [1282] => openssl_sign
            [1283] => openssl_verify
            [1284] => openssl_seal
            [1285] => openssl_open
            [1286] => openssl_pbkdf2
            [1287] => openssl_pkcs7_verify
            [1288] => openssl_pkcs7_decrypt
            [1289] => openssl_pkcs7_sign
            [1290] => openssl_pkcs7_encrypt
            [1291] => openssl_private_encrypt
            [1292] => openssl_private_decrypt
            [1293] => openssl_public_encrypt
            [1294] => openssl_public_decrypt
            [1295] => openssl_get_md_methods
            [1296] => openssl_get_cipher_methods
            [1297] => openssl_dh_compute_key
            [1298] => openssl_random_pseudo_bytes
            [1299] => openssl_error_string
            [1300] => zip_open
            [1301] => zip_close
            [1302] => zip_read
            [1303] => zip_entry_open
            [1304] => zip_entry_close
            [1305] => zip_entry_read
            [1306] => zip_entry_filesize
            [1307] => zip_entry_name
            [1308] => zip_entry_compressedsize
            [1309] => zip_entry_compressionmethod
        )

    [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
        )

)