这里显示系统所支持的所有函数,和自定义函数
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] => bcadd
            [46] => bcsub
            [47] => bcmul
            [48] => bcdiv
            [49] => bcmod
            [50] => bcpow
            [51] => bcsqrt
            [52] => bcscale
            [53] => bccomp
            [54] => bcpowmod
            [55] => jdtogregorian
            [56] => gregoriantojd
            [57] => jdtojulian
            [58] => juliantojd
            [59] => jdtojewish
            [60] => jewishtojd
            [61] => jdtofrench
            [62] => frenchtojd
            [63] => jddayofweek
            [64] => jdmonthname
            [65] => easter_date
            [66] => easter_days
            [67] => unixtojd
            [68] => jdtounix
            [69] => cal_to_jd
            [70] => cal_from_jd
            [71] => cal_days_in_month
            [72] => cal_info
            [73] => variant_set
            [74] => variant_add
            [75] => variant_cat
            [76] => variant_sub
            [77] => variant_mul
            [78] => variant_and
            [79] => variant_div
            [80] => variant_eqv
            [81] => variant_idiv
            [82] => variant_imp
            [83] => variant_mod
            [84] => variant_or
            [85] => variant_pow
            [86] => variant_xor
            [87] => variant_abs
            [88] => variant_fix
            [89] => variant_int
            [90] => variant_neg
            [91] => variant_not
            [92] => variant_round
            [93] => variant_cmp
            [94] => variant_date_to_timestamp
            [95] => variant_date_from_timestamp
            [96] => variant_get_type
            [97] => variant_set_type
            [98] => variant_cast
            [99] => com_create_guid
            [100] => com_event_sink
            [101] => com_print_typeinfo
            [102] => com_message_pump
            [103] => com_load_typelib
            [104] => com_get_active_object
            [105] => ctype_alnum
            [106] => ctype_alpha
            [107] => ctype_cntrl
            [108] => ctype_digit
            [109] => ctype_lower
            [110] => ctype_graph
            [111] => ctype_print
            [112] => ctype_punct
            [113] => ctype_space
            [114] => ctype_upper
            [115] => ctype_xdigit
            [116] => strtotime
            [117] => date
            [118] => idate
            [119] => gmdate
            [120] => mktime
            [121] => gmmktime
            [122] => checkdate
            [123] => strftime
            [124] => gmstrftime
            [125] => time
            [126] => localtime
            [127] => getdate
            [128] => date_create
            [129] => date_parse
            [130] => date_format
            [131] => date_modify
            [132] => date_timezone_get
            [133] => date_timezone_set
            [134] => date_offset_get
            [135] => date_time_set
            [136] => date_date_set
            [137] => date_isodate_set
            [138] => timezone_open
            [139] => timezone_name_get
            [140] => timezone_name_from_abbr
            [141] => timezone_offset_get
            [142] => timezone_transitions_get
            [143] => timezone_identifiers_list
            [144] => timezone_abbreviations_list
            [145] => date_default_timezone_set
            [146] => date_default_timezone_get
            [147] => date_sunrise
            [148] => date_sunset
            [149] => date_sun_info
            [150] => filter_input
            [151] => filter_var
            [152] => filter_input_array
            [153] => filter_var_array
            [154] => filter_list
            [155] => filter_has_var
            [156] => filter_id
            [157] => ftp_connect
            [158] => ftp_login
            [159] => ftp_pwd
            [160] => ftp_cdup
            [161] => ftp_chdir
            [162] => ftp_exec
            [163] => ftp_raw
            [164] => ftp_mkdir
            [165] => ftp_rmdir
            [166] => ftp_chmod
            [167] => ftp_alloc
            [168] => ftp_nlist
            [169] => ftp_rawlist
            [170] => ftp_systype
            [171] => ftp_pasv
            [172] => ftp_get
            [173] => ftp_fget
            [174] => ftp_put
            [175] => ftp_fput
            [176] => ftp_size
            [177] => ftp_mdtm
            [178] => ftp_rename
            [179] => ftp_delete
            [180] => ftp_site
            [181] => ftp_close
            [182] => ftp_set_option
            [183] => ftp_get_option
            [184] => ftp_nb_fget
            [185] => ftp_nb_get
            [186] => ftp_nb_continue
            [187] => ftp_nb_put
            [188] => ftp_nb_fput
            [189] => ftp_quit
            [190] => hash
            [191] => hash_file
            [192] => hash_hmac
            [193] => hash_hmac_file
            [194] => hash_init
            [195] => hash_update
            [196] => hash_update_stream
            [197] => hash_update_file
            [198] => hash_final
            [199] => hash_algos
            [200] => iconv
            [201] => ob_iconv_handler
            [202] => iconv_get_encoding
            [203] => iconv_set_encoding
            [204] => iconv_strlen
            [205] => iconv_substr
            [206] => iconv_strpos
            [207] => iconv_strrpos
            [208] => iconv_mime_encode
            [209] => iconv_mime_decode
            [210] => iconv_mime_decode_headers
            [211] => json_encode
            [212] => json_decode
            [213] => odbc_autocommit
            [214] => odbc_binmode
            [215] => odbc_close
            [216] => odbc_close_all
            [217] => odbc_columns
            [218] => odbc_commit
            [219] => odbc_connect
            [220] => odbc_cursor
            [221] => odbc_data_source
            [222] => odbc_execute
            [223] => odbc_error
            [224] => odbc_errormsg
            [225] => odbc_exec
            [226] => odbc_fetch_array
            [227] => odbc_fetch_object
            [228] => odbc_fetch_row
            [229] => odbc_fetch_into
            [230] => odbc_field_len
            [231] => odbc_field_scale
            [232] => odbc_field_name
            [233] => odbc_field_type
            [234] => odbc_field_num
            [235] => odbc_free_result
            [236] => odbc_gettypeinfo
            [237] => odbc_longreadlen
            [238] => odbc_next_result
            [239] => odbc_num_fields
            [240] => odbc_num_rows
            [241] => odbc_pconnect
            [242] => odbc_prepare
            [243] => odbc_result
            [244] => odbc_result_all
            [245] => odbc_rollback
            [246] => odbc_setoption
            [247] => odbc_specialcolumns
            [248] => odbc_statistics
            [249] => odbc_tables
            [250] => odbc_primarykeys
            [251] => odbc_columnprivileges
            [252] => odbc_tableprivileges
            [253] => odbc_foreignkeys
            [254] => odbc_procedures
            [255] => odbc_procedurecolumns
            [256] => odbc_do
            [257] => odbc_field_precision
            [258] => preg_match
            [259] => preg_match_all
            [260] => preg_replace
            [261] => preg_replace_callback
            [262] => preg_split
            [263] => preg_quote
            [264] => preg_grep
            [265] => preg_last_error
            [266] => session_name
            [267] => session_module_name
            [268] => session_save_path
            [269] => session_id
            [270] => session_regenerate_id
            [271] => session_decode
            [272] => session_register
            [273] => session_unregister
            [274] => session_is_registered
            [275] => session_encode
            [276] => session_start
            [277] => session_destroy
            [278] => session_unset
            [279] => session_set_save_handler
            [280] => session_cache_limiter
            [281] => session_cache_expire
            [282] => session_set_cookie_params
            [283] => session_get_cookie_params
            [284] => session_write_close
            [285] => session_commit
            [286] => spl_classes
            [287] => spl_autoload
            [288] => spl_autoload_extensions
            [289] => spl_autoload_register
            [290] => spl_autoload_unregister
            [291] => spl_autoload_functions
            [292] => spl_autoload_call
            [293] => class_parents
            [294] => class_implements
            [295] => spl_object_hash
            [296] => iterator_to_array
            [297] => iterator_count
            [298] => iterator_apply
            [299] => constant
            [300] => bin2hex
            [301] => sleep
            [302] => usleep
            [303] => flush
            [304] => wordwrap
            [305] => htmlspecialchars
            [306] => htmlentities
            [307] => html_entity_decode
            [308] => htmlspecialchars_decode
            [309] => get_html_translation_table
            [310] => sha1
            [311] => sha1_file
            [312] => md5
            [313] => md5_file
            [314] => crc32
            [315] => iptcparse
            [316] => iptcembed
            [317] => getimagesize
            [318] => image_type_to_mime_type
            [319] => image_type_to_extension
            [320] => phpinfo
            [321] => phpversion
            [322] => phpcredits
            [323] => php_logo_guid
            [324] => php_real_logo_guid
            [325] => php_egg_logo_guid
            [326] => zend_logo_guid
            [327] => php_sapi_name
            [328] => php_uname
            [329] => php_ini_scanned_files
            [330] => php_ini_loaded_file
            [331] => strnatcmp
            [332] => strnatcasecmp
            [333] => substr_count
            [334] => strspn
            [335] => strcspn
            [336] => strtok
            [337] => strtoupper
            [338] => strtolower
            [339] => strpos
            [340] => stripos
            [341] => strrpos
            [342] => strripos
            [343] => strrev
            [344] => hebrev
            [345] => hebrevc
            [346] => nl2br
            [347] => basename
            [348] => dirname
            [349] => pathinfo
            [350] => stripslashes
            [351] => stripcslashes
            [352] => strstr
            [353] => stristr
            [354] => strrchr
            [355] => str_shuffle
            [356] => str_word_count
            [357] => str_split
            [358] => strpbrk
            [359] => substr_compare
            [360] => strcoll
            [361] => substr
            [362] => substr_replace
            [363] => quotemeta
            [364] => ucfirst
            [365] => ucwords
            [366] => strtr
            [367] => addslashes
            [368] => addcslashes
            [369] => rtrim
            [370] => str_replace
            [371] => str_ireplace
            [372] => str_repeat
            [373] => count_chars
            [374] => chunk_split
            [375] => trim
            [376] => ltrim
            [377] => strip_tags
            [378] => similar_text
            [379] => explode
            [380] => implode
            [381] => setlocale
            [382] => localeconv
            [383] => soundex
            [384] => levenshtein
            [385] => chr
            [386] => ord
            [387] => parse_str
            [388] => str_pad
            [389] => chop
            [390] => strchr
            [391] => sprintf
            [392] => printf
            [393] => vprintf
            [394] => vsprintf
            [395] => fprintf
            [396] => vfprintf
            [397] => sscanf
            [398] => fscanf
            [399] => parse_url
            [400] => urlencode
            [401] => urldecode
            [402] => rawurlencode
            [403] => rawurldecode
            [404] => http_build_query
            [405] => unlink
            [406] => exec
            [407] => system
            [408] => escapeshellcmd
            [409] => escapeshellarg
            [410] => passthru
            [411] => shell_exec
            [412] => proc_open
            [413] => proc_close
            [414] => proc_terminate
            [415] => proc_get_status
            [416] => rand
            [417] => srand
            [418] => getrandmax
            [419] => mt_rand
            [420] => mt_srand
            [421] => mt_getrandmax
            [422] => getservbyname
            [423] => getservbyport
            [424] => getprotobyname
            [425] => getprotobynumber
            [426] => getmyuid
            [427] => getmygid
            [428] => getmypid
            [429] => getmyinode
            [430] => getlastmod
            [431] => base64_decode
            [432] => base64_encode
            [433] => convert_uuencode
            [434] => convert_uudecode
            [435] => abs
            [436] => ceil
            [437] => floor
            [438] => round
            [439] => sin
            [440] => cos
            [441] => tan
            [442] => asin
            [443] => acos
            [444] => atan
            [445] => atan2
            [446] => sinh
            [447] => cosh
            [448] => tanh
            [449] => pi
            [450] => is_finite
            [451] => is_nan
            [452] => is_infinite
            [453] => pow
            [454] => exp
            [455] => log
            [456] => log10
            [457] => sqrt
            [458] => hypot
            [459] => deg2rad
            [460] => rad2deg
            [461] => bindec
            [462] => hexdec
            [463] => octdec
            [464] => decbin
            [465] => decoct
            [466] => dechex
            [467] => base_convert
            [468] => number_format
            [469] => fmod
            [470] => ip2long
            [471] => long2ip
            [472] => getenv
            [473] => putenv
            [474] => microtime
            [475] => gettimeofday
            [476] => uniqid
            [477] => quoted_printable_decode
            [478] => convert_cyr_string
            [479] => get_current_user
            [480] => set_time_limit
            [481] => get_cfg_var
            [482] => magic_quotes_runtime
            [483] => set_magic_quotes_runtime
            [484] => get_magic_quotes_gpc
            [485] => get_magic_quotes_runtime
            [486] => import_request_variables
            [487] => error_log
            [488] => error_get_last
            [489] => call_user_func
            [490] => call_user_func_array
            [491] => call_user_method
            [492] => call_user_method_array
            [493] => serialize
            [494] => unserialize
            [495] => var_dump
            [496] => var_export
            [497] => debug_zval_dump
            [498] => print_r
            [499] => memory_get_usage
            [500] => memory_get_peak_usage
            [501] => register_shutdow