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_parent_class
            [15] => method_exists
            [16] => property_exists
            [17] => class_exists
            [18] => interface_exists
            [19] => function_exists
            [20] => get_included_files
            [21] => get_required_files
            [22] => is_subclass_of
            [23] => is_a
            [24] => get_class_vars
            [25] => get_object_vars
            [26] => get_class_methods
            [27] => trigger_error
            [28] => user_error
            [29] => set_error_handler
            [30] => restore_error_handler
            [31] => set_exception_handler
            [32] => restore_exception_handler
            [33] => get_declared_classes
            [34] => get_declared_interfaces
            [35] => get_defined_functions
            [36] => get_defined_vars
            [37] => create_function
            [38] => get_resource_type
            [39] => get_loaded_extensions
            [40] => extension_loaded
            [41] => get_extension_funcs
            [42] => get_defined_constants
            [43] => debug_backtrace
            [44] => debug_print_backtrace
            [45] => strtotime
            [46] => date
            [47] => idate
            [48] => gmdate
            [49] => mktime
            [50] => gmmktime
            [51] => checkdate
            [52] => strftime
            [53] => gmstrftime
            [54] => time
            [55] => localtime
            [56] => getdate
            [57] => date_create
            [58] => date_parse
            [59] => date_format
            [60] => date_modify
            [61] => date_timezone_get
            [62] => date_timezone_set
            [63] => date_offset_get
            [64] => date_time_set
            [65] => date_date_set
            [66] => date_isodate_set
            [67] => timezone_open
            [68] => timezone_name_get
            [69] => timezone_name_from_abbr
            [70] => timezone_offset_get
            [71] => timezone_transitions_get
            [72] => timezone_identifiers_list
            [73] => timezone_abbreviations_list
            [74] => date_default_timezone_set
            [75] => date_default_timezone_get
            [76] => date_sunrise
            [77] => date_sunset
            [78] => date_sun_info
            [79] => libxml_set_streams_context
            [80] => libxml_use_internal_errors
            [81] => libxml_get_last_error
            [82] => libxml_clear_errors
            [83] => libxml_get_errors
            [84] => libxml_disable_entity_loader
            [85] => preg_match
            [86] => preg_match_all
            [87] => preg_replace
            [88] => preg_replace_callback
            [89] => preg_split
            [90] => preg_quote
            [91] => preg_grep
            [92] => preg_last_error
            [93] => readgzfile
            [94] => gzrewind
            [95] => gzclose
            [96] => gzeof
            [97] => gzgetc
            [98] => gzgets
            [99] => gzgetss
            [100] => gzread
            [101] => gzopen
            [102] => gzpassthru
            [103] => gzseek
            [104] => gztell
            [105] => gzwrite
            [106] => gzputs
            [107] => gzfile
            [108] => gzcompress
            [109] => gzuncompress
            [110] => gzdeflate
            [111] => gzinflate
            [112] => gzencode
            [113] => ob_gzhandler
            [114] => zlib_get_coding_type
            [115] => ctype_alnum
            [116] => ctype_alpha
            [117] => ctype_cntrl
            [118] => ctype_digit
            [119] => ctype_lower
            [120] => ctype_graph
            [121] => ctype_print
            [122] => ctype_punct
            [123] => ctype_space
            [124] => ctype_upper
            [125] => ctype_xdigit
            [126] => curl_init
            [127] => curl_copy_handle
            [128] => curl_version
            [129] => curl_setopt
            [130] => curl_setopt_array
            [131] => curl_exec
            [132] => curl_getinfo
            [133] => curl_error
            [134] => curl_errno
            [135] => curl_close
            [136] => curl_multi_init
            [137] => curl_multi_add_handle
            [138] => curl_multi_remove_handle
            [139] => curl_multi_select
            [140] => curl_multi_exec
            [141] => curl_multi_getcontent
            [142] => curl_multi_info_read
            [143] => curl_multi_close
            [144] => dom_import_simplexml
            [145] => filter_input
            [146] => filter_var
            [147] => filter_input_array
            [148] => filter_var_array
            [149] => filter_list
            [150] => filter_has_var
            [151] => filter_id
            [152] => ftp_connect
            [153] => ftp_login
            [154] => ftp_pwd
            [155] => ftp_cdup
            [156] => ftp_chdir
            [157] => ftp_exec
            [158] => ftp_raw
            [159] => ftp_mkdir
            [160] => ftp_rmdir
            [161] => ftp_chmod
            [162] => ftp_alloc
            [163] => ftp_nlist
            [164] => ftp_rawlist
            [165] => ftp_systype
            [166] => ftp_pasv
            [167] => ftp_get
            [168] => ftp_fget
            [169] => ftp_put
            [170] => ftp_fput
            [171] => ftp_size
            [172] => ftp_mdtm
            [173] => ftp_rename
            [174] => ftp_delete
            [175] => ftp_site
            [176] => ftp_close
            [177] => ftp_set_option
            [178] => ftp_get_option
            [179] => ftp_nb_fget
            [180] => ftp_nb_get
            [181] => ftp_nb_continue
            [182] => ftp_nb_put
            [183] => ftp_nb_fput
            [184] => ftp_quit
            [185] => gd_info
            [186] => imagearc
            [187] => imageellipse
            [188] => imagechar
            [189] => imagecharup
            [190] => imagecolorat
            [191] => imagecolorallocate
            [192] => imagepalettecopy
            [193] => imagecreatefromstring
            [194] => imagecolorclosest
            [195] => imagecolorclosesthwb
            [196] => imagecolordeallocate
            [197] => imagecolorresolve
            [198] => imagecolorexact
            [199] => imagecolorset
            [200] => imagecolortransparent
            [201] => imagecolorstotal
            [202] => imagecolorsforindex
            [203] => imagecopy
            [204] => imagecopymerge
            [205] => imagecopymergegray
            [206] => imagecopyresized
            [207] => imagecreate
            [208] => imagecreatetruecolor
            [209] => imageistruecolor
            [210] => imagetruecolortopalette
            [211] => imagesetthickness
            [212] => imagefilledarc
            [213] => imagefilledellipse
            [214] => imagealphablending
            [215] => imagesavealpha
            [216] => imagecolorallocatealpha
            [217] => imagecolorresolvealpha
            [218] => imagecolorclosestalpha
            [219] => imagecolorexactalpha
            [220] => imagecopyresampled
            [221] => imagerotate
            [222] => imageantialias
            [223] => imagesettile
            [224] => imagesetbrush
            [225] => imagesetstyle
            [226] => imagecreatefrompng
            [227] => imagecreatefromgif
            [228] => imagecreatefromwbmp
            [229] => imagecreatefromxbm
            [230] => imagecreatefromgd
            [231] => imagecreatefromgd2
            [232] => imagecreatefromgd2part
            [233] => imagepng
            [234] => imagegif
            [235] => imagewbmp
            [236] => imagegd
            [237] => imagegd2
            [238] => imagedestroy
            [239] => imagegammacorrect
            [240] => imagefill
            [241] => imagefilledpolygon
            [242] => imagefilledrectangle
            [243] => imagefilltoborder
            [244] => imagefontwidth
            [245] => imagefontheight
            [246] => imageinterlace
            [247] => imageline
            [248] => imageloadfont
            [249] => imagepolygon
            [250] => imagerectangle
            [251] => imagesetpixel
            [252] => imagestring
            [253] => imagestringup
            [254] => imagesx
            [255] => imagesy
            [256] => imagedashedline
            [257] => imagetypes
            [258] => png2wbmp
            [259] => image2wbmp
            [260] => imagelayereffect
            [261] => imagecolormatch
            [262] => imagexbm
            [263] => imagefilter
            [264] => imageconvolution
            [265] => hash
            [266] => hash_file
            [267] => hash_hmac
            [268] => hash_hmac_file
            [269] => hash_init
            [270] => hash_update
            [271] => hash_update_stream
            [272] => hash_update_file
            [273] => hash_final
            [274] => hash_algos
            [275] => json_encode
            [276] => json_decode
            [277] => mb_convert_case
            [278] => mb_strtoupper
            [279] => mb_strtolower
            [280] => mb_language
            [281] => mb_internal_encoding
            [282] => mb_http_input
            [283] => mb_http_output
            [284] => mb_detect_order
            [285] => mb_substitute_character
            [286] => mb_parse_str
            [287] => mb_output_handler
            [288] => mb_preferred_mime_name
            [289] => mb_strlen
            [290] => mb_strpos
            [291] => mb_strrpos
            [292] => mb_stripos
            [293] => mb_strripos
            [294] => mb_strstr
            [295] => mb_strrchr
            [296] => mb_stristr
            [297] => mb_strrichr
            [298] => mb_substr_count
            [299] => mb_substr
            [300] => mb_strcut
            [301] => mb_strwidth
            [302] => mb_strimwidth
            [303] => mb_convert_encoding
            [304] => mb_detect_encoding
            [305] => mb_list_encodings
            [306] => mb_convert_kana
            [307] => mb_encode_mimeheader
            [308] => mb_decode_mimeheader
            [309] => mb_convert_variables
            [310] => mb_encode_numericentity
            [311] => mb_decode_numericentity
            [312] => mb_send_mail
            [313] => mb_get_info
            [314] => mb_check_encoding
            [315] => mb_regex_encoding
            [316] => mb_regex_set_options
            [317] => mb_ereg
            [318] => mb_eregi
            [319] => mb_ereg_replace
            [320] => mb_eregi_replace
            [321] => mb_split
            [322] => mb_ereg_match
            [323] => mb_ereg_search
            [324] => mb_ereg_search_pos
            [325] => mb_ereg_search_regs
            [326] => mb_ereg_search_init
            [327] => mb_ereg_search_getregs
            [328] => mb_ereg_search_getpos
            [329] => mb_ereg_search_setpos
            [330] => mbregex_encoding
            [331] => mbereg
            [332] => mberegi
            [333] => mbereg_replace
            [334] => mberegi_replace
            [335] => mbsplit
            [336] => mbereg_match
            [337] => mbereg_search
            [338] => mbereg_search_pos
            [339] => mbereg_search_regs
            [340] => mbereg_search_init
            [341] => mbereg_search_getregs
            [342] => mbereg_search_getpos
            [343] => mbereg_search_setpos
            [344] => mysql_connect
            [345] => mysql_pconnect
            [346] => mysql_close
            [347] => mysql_select_db
            [348] => mysql_query
            [349] => mysql_unbuffered_query
            [350] => mysql_db_query
            [351] => mysql_list_dbs
            [352] => mysql_list_tables
            [353] => mysql_list_fields
            [354] => mysql_list_processes
            [355] => mysql_error
            [356] => mysql_errno
            [357] => mysql_affected_rows
            [358] => mysql_insert_id
            [359] => mysql_result
            [360] => mysql_num_rows
            [361] => mysql_num_fields
            [362] => mysql_fetch_row
            [363] => mysql_fetch_array
            [364] => mysql_fetch_assoc
            [365] => mysql_fetch_object
            [366] => mysql_data_seek
            [367] => mysql_fetch_lengths
            [368] => mysql_fetch_field
            [369] => mysql_field_seek
            [370] => mysql_free_result
            [371] => mysql_field_name
            [372] => mysql_field_table
            [373] => mysql_field_len
            [374] => mysql_field_type
            [375] => mysql_field_flags
            [376] => mysql_escape_string
            [377] => mysql_real_escape_string
            [378] => mysql_stat
            [379] => mysql_thread_id
            [380] => mysql_client_encoding
            [381] => mysql_ping
            [382] => mysql_get_client_info
            [383] => mysql_get_host_info
            [384] => mysql_get_proto_info
            [385] => mysql_get_server_info
            [386] => mysql_info
            [387] => mysql_set_charset
            [388] => mysql
            [389] => mysql_fieldname
            [390] => mysql_fieldtable
            [391] => mysql_fieldlen
            [392] => mysql_fieldtype
            [393] => mysql_fieldflags
            [394] => mysql_selectdb
            [395] => mysql_freeresult
            [396] => mysql_numfields
            [397] => mysql_numrows
            [398] => mysql_listdbs
            [399] => mysql_listtables
            [400] => mysql_listfields
            [401] => mysql_db_name
            [402] => mysql_dbname
            [403] => mysql_tablename
            [404] => mysql_table_name
            [405] => spl_classes
            [406] => spl_autoload
            [407] => spl_autoload_extensions
            [408] => spl_autoload_register
            [409] => spl_autoload_unregister
            [410] => spl_autoload_functions
            [411] => spl_autoload_call
            [412] => class_parents
            [413] => class_implements
            [414] => spl_object_hash
            [415] => iterator_to_array
            [416] => iterator_count
            [417] => iterator_apply
            [418] => pdo_drivers
            [419] => posix_kill
            [420] => posix_getpid
            [421] => posix_getppid
            [422] => posix_getuid
            [423] => posix_setuid
            [424] => posix_geteuid
            [425] => posix_seteuid
            [426] => posix_getgid
            [427] => posix_setgid
            [428] => posix_getegid
            [429] => posix_setegid
            [430] => posix_getgroups
            [431] => posix_getlogin
            [432] => posix_getpgrp
            [433] => posix_setsid
            [434] => posix_setpgid
            [435] => posix_getpgid
            [436] => posix_getsid
            [437] => posix_uname
            [438] => posix_times
            [439] => posix_ctermid
            [440] => posix_ttyname
            [441] => posix_isatty
            [442] => posix_getcwd
            [443] => posix_mkfifo
            [444] => posix_mknod
            [445] => posix_access
            [446] => posix_getgrnam
            [447] => posix_getgrgid
            [448] => posix_getpwnam
            [449] => posix_getpwuid
            [450] => posix_getrlimit
            [451] => posix_get_last_error
            [452] => posix_errno
            [453] => posix_strerror
            [454] => posix_initgroups
            [455] => session_name
            [456] => session_module_name
            [457] => session_save_path
            [458] => session_id
            [459] => session_regenerate_id
            [460] => session_decode
            [461] => session_register
            [462] => session_unregister
            [463] => session_is_registered
            [464] => session_encode
            [465] => session_start
            [466] => session_destroy
            [467] => session_unset
            [468] => session_set_save_handler
            [469] => session_cache_limiter
            [470] => session_cache_expire
            [471] => session_set_cookie_params
            [472] => session_get_cookie_params
            [473] => session_write_close
            [474] => session_commit
            [475] => simplexml_load_file
            [476] => simplexml_load_string
            [477] => simplexml_import_dom
            [478] => sqlite_open
            [479] => sqlite_popen
            [480] => sqlite_close
            [481] => sqlite_query
            [482] => sqlite_exec
            [483] => sqlite_array_query
            [484] => sqlite_single_query
            [485] => sqlite_fetch_array
            [486] => sqlite_fetch_object
            [487] => sqlite_fetch_single
            [488] => sqlite_fetch_string
            [489] => sqlite_fetch_all
            [490] => sqlite_current
            [491] => sqlite_column
            [492] => sqlite_libversion
            [493] => sqlite_libencoding
            [494] => sqlite_changes
            [495] => sqlite_last_insert_rowid
            [496] => sqlite_num_rows
            [497] => sqlite_num_fields
            [498] => sqlite_field_name
            [499] => sqlite_seek
            [500] => sqlite_rewind
            [501] => sqlite_next
            [502] => sqlite_prev
            [503] => sqlite_valid
            [504] => sqlite_has_more
            [505] => sqlite_has_prev
            [506] => sqlite_escape_string
            [507] => sqlite_busy_timeout
            [508] => sqlite_last_error
            [509] => sqlite_error_string
            [510] => sqlite_unbuffered_query
            [511] => sqlite_create_aggregate
            [512] => sqlite_create_function
            [513] => sqlite_factory
            [514] => sqlite_udf_encode_binary
            [515] => sqlite_udf_decode_binary
            [516] => sqlite_fetch_column_types
            [517] => constant
            [518] => bin2hex
            [519] => sleep
            [520] => usleep
            [521] => time_nanosleep
            [522] => time_sleep_until
            [523] => strptime
            [524] => flush
            [525] => wordwrap
            [526] => htmlspecialchars
            [527] => htmlentities
            [528] => html_entity_decode
            [529] => htmlspecialchars_decode
            [530] => get_html_translation_table
            [531] => sha1
            [532] => sha1_file
            [533] => md5
            [534] => md5_file
            [535] => crc32
            [536] => iptcparse
            [537] => iptcembed
            [538] => getimagesize
            [539] => image_type_to_mime_type
            [540] => image_type_to_extension
            [541] => phpinfo
            [542] => phpversion
            [543] => phpcredits
            [544] => php_logo_guid
            [545] => php_real_logo_guid
            [546] => php_egg_logo_guid
            [547] => zend_logo_guid
            [548] => php_sapi_name
            [549] => php_uname
            [550] => php_ini_scanned_files
            [551] => php_ini_loaded_file
            [552] => strnatcmp
            [553] => strnatcasecmp
            [554] => substr_count
            [555] => strspn
            [556] => strcspn
            [557] => strtok
            [558] => strtoupper
            [559] => strtolower
            [560] => strpos
            [561] => stripos
            [562] => strrpos
            [563] => strripos
            [564] => strrev
            [565] => hebrev
            [566] => hebrevc
            [567] => nl2br
            [568] => basename
            [569] => dirname
            [570] => pathinfo
            [571] => stripslashes
            [572] => stripcslashes
            [573] => strstr
            [574] => stristr
            [575] => strrchr
            [576] => str_shuffle
            [577] => str_word_count
            [578] => str_split
            [579] => strpbrk
            [580] => substr_compare
            [581] => strcoll
            [582] => money_format
            [583] => substr
            [584] => substr_replace
            [585] => quotemeta
            [586] => ucfirst
            [587] => ucwords
            [588] => strtr
            [589] => addslashes
            [590] => addcslashes
            [591] => rtrim
            [592] => str_replace
            [593] => str_ireplace
            [594] => str_repeat
            [595] => count_chars
            [596] => chunk_split
            [597] => trim
            [598] => ltrim
            [599] => strip_tags
            [600] => similar_text
            [601] => explode
            [602] => implode
            [603] => setlocale
            [604] => localeconv
            [605] => nl_langinfo
            [606] => soundex
            [607] => levenshtein
            [608] => chr
            [609] => ord
            [610] => parse_str
            [611] => str_pad
            [612] => chop
            [613] => strchr
            [614] => sprintf
            [615] => printf
            [616] => vprintf
            [617] => vsprintf
            [618] => fprintf
            [619] => vfprintf
            [620] => sscanf
            [621] => fscanf
            [622] => parse_url
            [623] => urlencode
            [624] => urldecode
            [625] => rawurlencode
            [626] => rawurldecode
            [627] => http_build_query
            [628] => readlink
            [629] => linkinfo
            [630] => symlink
            [631] => link
            [632] => unlink
            [633] => exec
            [634] => system
            [635] => escapeshellcmd
            [636] => escapeshellarg
            [637] => passthru
            [638] => shell_exec
            [639] => proc_open
            [640] => proc_close
            [641] => proc_terminate
            [642] => proc_get_status
            [643] => proc_nice
            [644] => rand
            [645] => srand
            [646] => getrandmax
            [647] => mt_rand
            [648] => mt_srand
            [649] => mt_getrandmax
            [650] => getservbyname
            [651] => getservbyport
            [652] => getprotobyname
            [653] => getprotobynumber
            [654] => getmyuid
            [655] => getmygid
            [656] => getmypid
            [657] => getmyinode
            [658] => getlastmod
            [659] => base64_decode
            [660] => base64_encode
            [661] => convert_uuencode
            [662] => convert_uudecode
            [663] => abs
            [664] => ceil
            [665] => floor
            [666] => round
            [667] => sin
            [668] => cos
            [669] => tan
            [670] => asin
            [671] => acos
            [672] => atan
            [673] => atan2
            [674] => sinh
            [675] => cosh
            [676] => tanh
            [677] => asinh
            [678] => acosh
            [679] => atanh
            [680] => expm1
            [681] => log1p
            [682] => pi
            [683] => is_finite
            [684] => is_nan
            [685] => is_infinite
            [686] => pow
            [687] => exp
            [688] => log
            [689] => log10
            [690] => sqrt
            [691] => hypot
            [692] => deg2rad
            [693] => rad2deg
            [694] => bindec
            [695] => hexdec
            [696] => octdec
            [697] => decbin
            [698] => decoct
            [699] => dechex
            [700] => base_convert
            [701] => number_format
            [702] => fmod
            [703] => inet_ntop
            [704] => inet_pton
            [705] => ip2long
            [706] => long2ip
            [707] => getenv
            [708] => putenv
            [709] => getopt
            [710] => sys_getloadavg
            [711] => microtime
            [712] => gettimeofday
            [713] => getrusage
            [714] => uniqid
            [715] => quoted_printable_decode
            [716] => convert_cyr_string
            [717] => get_current_user
            [718] => set_time_limit
            [719] => get_cfg_var
            [720] => magic_quotes_runtime
            [721] => set_magic_quotes_runtime
            [722] => get_magic_quotes_gpc
            [723] => get_magic_quotes_runtime
            [724] => import_request_variables
            [725] => error_log
            [726] => error_get_last
            [727] => call_user_func
            [728] => call_user_func_array
            [729] => call_user_method
            [730] => call_user_method_array
            [731] => serialize
            [732] => unserialize
            [733] => var_dump
            [734] => var_export
            [735] => debug_zval_dump
            [736] => print_r
            [737] => memory_get_usage
            [738] => memory_get_peak_usage
            [739] => register_shutdown_function
            [740] => register_tick_function
            [741] => unregister_tick_function
            [742] => highlight_file
            [743] => show_source
            [744] => highlight_string
            [745] => php_strip_whitespace
            [746] => ini_get
            [747] => ini_get_all
            [748] => ini_set
            [749] => ini_alter
            [750] => ini_restore
            [751] => get_include_path
            [752] => set_include_path
            [753] => restore_include_path
            [754] => setcookie
            [755] => setrawcookie
            [756] => header
            [757] => headers_sent
            [758] => headers_list
            [759] => connection_aborted
            [760] => connection_status
            [761] => ignore_user_abort
            [762] => parse_ini_file
            [763] => is_uploaded_file
            [764] => move_uploaded_file
            [765] => gethostbyaddr
            [766] => gethostbyname
            [767] => gethostbynamel
            [768] => dns_check_record
            [769] => checkdnsrr
            [770] => dns_get_mx
            [771] => getmxrr
            [772] => dns_get_record
            [773] => intval
            [774] => floatval
            [775] => doubleval
            [776] => strval
            [777] => gettype
            [778] => settype
            [779] => is_null
            [780] => is_resource
            [781] => is_bool
            [782] => is_long
            [783] => is_float
            [784] => is_int
            [785] => is_integer
            [786] => is_double
            [787] => is_real
            [788] => is_numeric
            [789] => is_string
            [790] => is_array
            [791] => is_object
            [792] => is_scalar
            [793] => is_callable
            [794] => ereg
            [795] => ereg_replace
            [796] => eregi
            [797] => eregi_replace
            [798] => split
            [799] => spliti
            [800] => join
            [801] => sql_regcase
            [802] => dl
            [803] => pclose
            [804] => popen
            [805] => readfile
            [806] => rewind
            [807] => rmdir
            [808] => umask
            [809] => fclose
            [810] => feof
            [811] => fgetc
            [812] => fgets
            [813] => fgetss
            [814] => fread
            [815] => fopen
            [816] => fpassthru
            [817] => ftruncate
            [818] => fstat
            [819] => fseek
            [820] => ftell
            [821] => fflush
            [822] => fwrite
            [823] => fputs
            [824] => mkdir
            [825] => rename
            [826] => copy
            [827] => tempnam
            [828] => tmpfile
            [829] => file
            [830] => file_get_contents
            [831] => file_put_contents
            [832] => stream_select
            [833] => stream_context_create
            [834] => stream_context_set_params
            [835] => stream_context_set_option
            [836] => stream_context_get_options
            [837] => stream_context_get_default
            [838] => stream_filter_prepend
            [839] => stream_filter_append
            [840] => stream_filter_remove
            [841] => stream_socket_client
            [842] => stream_socket_server
            [843] => stream_socket_accept
            [844] => stream_socket_get_name
            [845] => stream_socket_recvfrom
            [846] => stream_socket_sendto
            [847] => stream_socket_enable_crypto
            [848] => stream_socket_shutdown
            [849] => stream_socket_pair
            [850] => stream_copy_to_stream
            [851] => stream_get_contents
            [852] => fgetcsv
            [853] => fputcsv
            [854] => flock
            [855] => get_meta_tags
            [856] => stream_set_write_buffer
            [857] => set_file_buffer
            [858] => set_socket_blocking
            [859] => stream_set_blocking
            [860] => socket_set_blocking
            [861] => stream_get_meta_data
            [862] => stream_get_line
            [863] => stream_wrapper_register
            [864] => stream_register_wrapper
            [865] => stream_wrapper_unregister
            [866] => stream_wrapper_restore
            [867] => stream_get_wrappers
            [868] => stream_get_transports
            [869] => stream_is_local
            [870] => get_headers
            [871] => stream_set_timeout
            [872] => socket_set_timeout
            [873] => socket_get_status
            [874] => realpath
            [875] => fnmatch
            [876] => fsockopen
            [877] => pfsockopen
            [878] => pack
            [879] => unpack
            [880] => get_browser
            [881] => crypt
            [882] => opendir
            [883] => closedir
            [884] => chdir
            [885] => getcwd
            [886] => rewinddir
            [887] => readdir
            [888] => dir
            [889] => scandir
            [890] => glob
            [891] => fileatime
            [892] => filectime
            [893] => filegroup
            [894] => fileinode
            [895] => filemtime
            [896] => fileowner
            [897] => fileperms
            [898] => filesize
            [899] => filetype
            [900] => file_exists
            [901] => is_writable
            [902] => is_writeable
            [903] => is_readable
            [904] => is_executable
            [905] => is_file
            [906] => is_dir
            [907] => is_link
            [908] => stat
            [909] => lstat
            [910] => chown
            [911] => chgrp
            [912] => lchown
            [913] => lchgrp
            [914] => chmod
            [915] => touch
            [916] => clearstatcache
            [917] => disk_total_space
            [918] => disk_free_space
            [919] => diskfreespace
            [920] => mail
            [921] => ezmlm_hash
            [922] => openlog
            [923] => syslog
            [924] => closelog
            [925] => define_syslog_variables
            [926] => lcg_value
            [927] => metaphone
            [928] => ob_start
            [929] => ob_flush
            [930] => ob_clean
            [931] => ob_end_flush
            [932] => ob_end_clean
            [933] => ob_get_flush
            [934] => ob_get_clean
            [935] => ob_get_length
            [936] => ob_get_level
            [937] => ob_get_status
            [938] => ob_get_contents
            [939] => ob_implicit_flush
            [940] => ob_list_handlers
            [941] => ksort
            [942] => krsort
            [943] => natsort
            [944] => natcasesort
            [945] => asort
            [946] => arsort
            [947] => sort
            [948] => rsort
            [949] => usort
            [950] => uasort
            [951] => uksort
            [952] => shuffle
            [953] => array_walk
            [954] => array_walk_recursive
            [955] => count
            [956] => end
            [957] => prev
            [958] => next
            [959] => reset
            [960] => current
            [961] => key
            [962] => min
            [963] => max
            [964] => in_array
            [965] => array_search
            [966] => extract
            [967] => compact
            [968] => array_fill
            [969] => array_fill_keys
            [970] => range
            [971] => array_multisort
            [972] => array_push
            [973] => array_pop
            [974] => array_shift
            [975] => array_unshift
            [976] => array_splice
            [977] => array_slice
            [978] => array_merge
            [979] => array_merge_recursive
            [980] => array_keys
            [981] => array_values
            [982] => array_count_values
            [983] => array_reverse
            [984] => array_reduce
            [985] => array_pad
            [986] => array_flip
            [987] => array_change_key_case
            [988] => array_rand
            [989] => array_unique
            [990] => array_intersect
            [991] => array_intersect_key
            [992] => array_intersect_ukey
            [993] => array_uintersect
            [994] => array_intersect_assoc
            [995] => array_uintersect_assoc
            [996] => array_intersect_uassoc
            [997] => array_uintersect_uassoc
            [998] => array_diff
            [999] => array_diff_key
            [1000] => array_diff_ukey
            [1001] => array_udiff
            [1002] => array_diff_assoc
            [1003] => array_udiff_assoc
            [1004] => array_diff_uassoc
            [1005] => array_udiff_uassoc
            [1006] => array_sum
            [1007] => array_product
            [1008] => array_filter
            [1009] => array_map
            [1010] => array_chunk
            [1011] => array_combine
            [1012] => array_key_exists
            [1013] => pos
            [1014] => sizeof
            [1015] => key_exists
            [1016] => assert
            [1017] => assert_options
            [1018] => version_compare
            [1019] => ftok
            [1020] => str_rot13
            [1021] => stream_get_filters
            [1022] => stream_filter_register
            [1023] => stream_bucket_make_writeable
            [1024] => stream_bucket_prepend
            [1025] => stream_bucket_append
            [1026] => stream_bucket_new
            [1027] => output_add_rewrite_var
            [1028] => output_reset_rewrite_vars
            [1029] => sys_get_temp_dir
            [1030] => token_get_all
            [1031] => token_name
            [1032] => xml_parser_create
            [1033] => xml_parser_create_ns
            [1034] => xml_set_object
            [1035] => xml_set_element_handler
            [1036] => xml_set_character_data_handler
            [1037] => xml_set_processing_instruction_handler
            [1038] => xml_set_default_handler
            [1039] => xml_set_unparsed_entity_decl_handler
            [1040] => xml_set_notation_decl_handler
            [1041] => xml_set_external_entity_ref_handler
            [1042] => xml_set_start_namespace_decl_handler
            [1043] => xml_set_end_namespace_decl_handler
            [1044] => xml_parse
            [1045] => xml_parse_into_struct
            [1046] => xml_get_error_code
            [1047] => xml_error_string
            [1048] => xml_get_current_line_number
            [1049] => xml_get_current_column_number
            [1050] => xml_get_current_byte_index
            [1051] => xml_parser_free
            [1052] => xml_parser_set_option
            [1053] => xml_parser_get_option
            [1054] => utf8_encode
            [1055] => utf8_decode
            [1056] => xmlwriter_open_uri
            [1057] => xmlwriter_open_memory
            [1058] => xmlwriter_set_indent
            [1059] => xmlwriter_set_indent_string
            [1060] => xmlwriter_start_comment
            [1061] => xmlwriter_end_comment
            [1062] => xmlwriter_start_attribute
            [1063] => xmlwriter_end_attribute
            [1064] => xmlwriter_write_attribute
            [1065] => xmlwriter_start_attribute_ns
            [1066] => xmlwriter_write_attribute_ns
            [1067] => xmlwriter_start_element
            [1068] => xmlwriter_end_element
            [1069] => xmlwriter_full_end_element
            [1070] => xmlwriter_start_element_ns
            [1071] => xmlwriter_write_element
            [1072] => xmlwriter_write_element_ns
            [1073] => xmlwriter_start_pi
            [1074] => xmlwriter_end_pi
            [1075] => xmlwriter_write_pi
            [1076] => xmlwriter_start_cdata
            [1077] => xmlwriter_end_cdata
            [1078] => xmlwriter_write_cdata
            [1079] => xmlwriter_text
            [1080] => xmlwriter_write_raw
            [1081] => xmlwriter_start_document
            [1082] => xmlwriter_end_document
            [1083] => xmlwriter_write_comment
            [1084] => xmlwriter_start_dtd
            [1085] => xmlwriter_end_dtd
            [1086] => xmlwriter_write_dtd
            [1087] => xmlwriter_start_dtd_element
            [1088] => xmlwriter_end_dtd_element
            [1089] => xmlwriter_write_dtd_element
            [1090] => xmlwriter_start_dtd_attlist
            [1091] => xmlwriter_end_dtd_attlist
            [1092] => xmlwriter_write_dtd_attlist
            [1093] => xmlwriter_start_dtd_entity
            [1094] => xmlwriter_end_dtd_entity
            [1095] => xmlwriter_write_dtd_entity
            [1096] => xmlwriter_output_memory
            [1097] => xmlwriter_flush
            [1098] => zip_open
            [1099] => zip_close
            [1100] => zip_read
            [1101] => zip_entry_open
            [1102] => zip_entry_close
            [1103] => zip_entry_read
            [1104] => zip_entry_filesize
            [1105] => zip_entry_name
            [1106] => zip_entry_compressedsize
            [1107] => zip_entry_compressionmethod
            [1108] => apache_lookup_uri
            [1109] => virtual
            [1110] => apache_request_headers
            [1111] => apache_response_headers
            [1112] => apache_setenv
            [1113] => apache_getenv
            [1114] => apache_note
            [1115] => apache_get_version
            [1116] => apache_get_modules
            [1117] => 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
        )

)