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_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] => bcadd
            [54] => bcsub
            [55] => bcmul
            [56] => bcdiv
            [57] => bcmod
            [58] => bcpow
            [59] => bcsqrt
            [60] => bcscale
            [61] => bccomp
            [62] => bcpowmod
            [63] => jdtogregorian
            [64] => gregoriantojd
            [65] => jdtojulian
            [66] => juliantojd
            [67] => jdtojewish
            [68] => jewishtojd
            [69] => jdtofrench
            [70] => frenchtojd
            [71] => jddayofweek
            [72] => jdmonthname
            [73] => easter_date
            [74] => easter_days
            [75] => unixtojd
            [76] => jdtounix
            [77] => cal_to_jd
            [78] => cal_from_jd
            [79] => cal_days_in_month
            [80] => cal_info
            [81] => ctype_alnum
            [82] => ctype_alpha
            [83] => ctype_cntrl
            [84] => ctype_digit
            [85] => ctype_lower
            [86] => ctype_graph
            [87] => ctype_print
            [88] => ctype_punct
            [89] => ctype_space
            [90] => ctype_upper
            [91] => ctype_xdigit
            [92] => strtotime
            [93] => date
            [94] => idate
            [95] => gmdate
            [96] => mktime
            [97] => gmmktime
            [98] => checkdate
            [99] => strftime
            [100] => gmstrftime
            [101] => time
            [102] => localtime
            [103] => getdate
            [104] => date_create
            [105] => date_create_from_format
            [106] => date_parse
            [107] => date_parse_from_format
            [108] => date_get_last_errors
            [109] => date_format
            [110] => date_modify
            [111] => date_add
            [112] => date_sub
            [113] => date_timezone_get
            [114] => date_timezone_set
            [115] => date_offset_get
            [116] => date_diff
            [117] => date_time_set
            [118] => date_date_set
            [119] => date_isodate_set
            [120] => date_timestamp_set
            [121] => date_timestamp_get
            [122] => timezone_open
            [123] => timezone_name_get
            [124] => timezone_name_from_abbr
            [125] => timezone_offset_get
            [126] => timezone_transitions_get
            [127] => timezone_location_get
            [128] => timezone_identifiers_list
            [129] => timezone_abbreviations_list
            [130] => timezone_version_get
            [131] => date_interval_create_from_date_string
            [132] => date_interval_format
            [133] => date_default_timezone_set
            [134] => date_default_timezone_get
            [135] => date_sunrise
            [136] => date_sunset
            [137] => date_sun_info
            [138] => ereg
            [139] => ereg_replace
            [140] => eregi
            [141] => eregi_replace
            [142] => split
            [143] => spliti
            [144] => sql_regcase
            [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] => hash
            [186] => hash_file
            [187] => hash_hmac
            [188] => hash_hmac_file
            [189] => hash_init
            [190] => hash_update
            [191] => hash_update_stream
            [192] => hash_update_file
            [193] => hash_final
            [194] => hash_copy
            [195] => hash_algos
            [196] => mhash_keygen_s2k
            [197] => mhash_get_block_size
            [198] => mhash_get_hash_name
            [199] => mhash_count
            [200] => mhash
            [201] => iconv
            [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] => json_last_error
            [214] => mcrypt_ecb
            [215] => mcrypt_cbc
            [216] => mcrypt_cfb
            [217] => mcrypt_ofb
            [218] => mcrypt_get_key_size
            [219] => mcrypt_get_block_size
            [220] => mcrypt_get_cipher_name
            [221] => mcrypt_create_iv
            [222] => mcrypt_list_algorithms
            [223] => mcrypt_list_modes
            [224] => mcrypt_get_iv_size
            [225] => mcrypt_encrypt
            [226] => mcrypt_decrypt
            [227] => mcrypt_module_open
            [228] => mcrypt_generic_init
            [229] => mcrypt_generic
            [230] => mdecrypt_generic
            [231] => mcrypt_generic_end
            [232] => mcrypt_generic_deinit
            [233] => mcrypt_enc_self_test
            [234] => mcrypt_enc_is_block_algorithm_mode
            [235] => mcrypt_enc_is_block_algorithm
            [236] => mcrypt_enc_is_block_mode
            [237] => mcrypt_enc_get_block_size
            [238] => mcrypt_enc_get_key_size
            [239] => mcrypt_enc_get_supported_key_sizes
            [240] => mcrypt_enc_get_iv_size
            [241] => mcrypt_enc_get_algorithms_name
            [242] => mcrypt_enc_get_modes_name
            [243] => mcrypt_module_self_test
            [244] => mcrypt_module_is_block_algorithm_mode
            [245] => mcrypt_module_is_block_algorithm
            [246] => mcrypt_module_is_block_mode
            [247] => mcrypt_module_get_algo_block_size
            [248] => mcrypt_module_get_algo_key_size
            [249] => mcrypt_module_get_supported_key_sizes
            [250] => mcrypt_module_close
            [251] => odbc_autocommit
            [252] => odbc_binmode
            [253] => odbc_close
            [254] => odbc_close_all
            [255] => odbc_columns
            [256] => odbc_commit
            [257] => odbc_connect
            [258] => odbc_cursor
            [259] => odbc_data_source
            [260] => odbc_execute
            [261] => odbc_error
            [262] => odbc_errormsg
            [263] => odbc_exec
            [264] => odbc_fetch_array
            [265] => odbc_fetch_object
            [266] => odbc_fetch_row
            [267] => odbc_fetch_into
            [268] => odbc_field_len
            [269] => odbc_field_scale
            [270] => odbc_field_name
            [271] => odbc_field_type
            [272] => odbc_field_num
            [273] => odbc_free_result
            [274] => odbc_gettypeinfo
            [275] => odbc_longreadlen
            [276] => odbc_next_result
            [277] => odbc_num_fields
            [278] => odbc_num_rows
            [279] => odbc_pconnect
            [280] => odbc_prepare
            [281] => odbc_result
            [282] => odbc_result_all
            [283] => odbc_rollback
            [284] => odbc_setoption
            [285] => odbc_specialcolumns
            [286] => odbc_statistics
            [287] => odbc_tables
            [288] => odbc_primarykeys
            [289] => odbc_columnprivileges
            [290] => odbc_tableprivileges
            [291] => odbc_foreignkeys
            [292] => odbc_procedures
            [293] => odbc_procedurecolumns
            [294] => odbc_do
            [295] => odbc_field_precision
            [296] => preg_match
            [297] => preg_match_all
            [298] => preg_replace
            [299] => preg_replace_callback
            [300] => preg_filter
            [301] => preg_split
            [302] => preg_quote
            [303] => preg_grep
            [304] => preg_last_error
            [305] => session_name
            [306] => session_module_name
            [307] => session_save_path
            [308] => session_id
            [309] => session_regenerate_id
            [310] => session_decode
            [311] => session_encode
            [312] => session_start
            [313] => session_destroy
            [314] => session_unset
            [315] => session_set_save_handler
            [316] => session_cache_limiter
            [317] => session_cache_expire
            [318] => session_set_cookie_params
            [319] => session_get_cookie_params
            [320] => session_write_close
            [321] => session_status
            [322] => session_register_shutdown
            [323] => session_commit
            [324] => spl_classes
            [325] => spl_autoload
            [326] => spl_autoload_extensions
            [327] => spl_autoload_register
            [328] => spl_autoload_unregister
            [329] => spl_autoload_functions
            [330] => spl_autoload_call
            [331] => class_parents
            [332] => class_implements
            [333] => class_uses
            [334] => spl_object_hash
            [335] => iterator_to_array
            [336] => iterator_count
            [337] => iterator_apply
            [338] => constant
            [339] => bin2hex
            [340] => hex2bin
            [341] => sleep
            [342] => usleep
            [343] => time_nanosleep
            [344] => time_sleep_until
            [345] => flush
            [346] => wordwrap
            [347] => htmlspecialchars
            [348] => htmlentities
            [349] => html_entity_decode
            [350] => htmlspecialchars_decode
            [351] => get_html_translation_table
            [352] => sha1
            [353] => sha1_file
            [354] => md5
            [355] => md5_file
            [356] => crc32
            [357] => iptcparse
            [358] => iptcembed
            [359] => getimagesize
            [360] => getimagesizefromstring
            [361] => image_type_to_mime_type
            [362] => image_type_to_extension
            [363] => phpinfo
            [364] => phpversion
            [365] => phpcredits
            [366] => php_logo_guid
            [367] => php_real_logo_guid
            [368] => php_egg_logo_guid
            [369] => zend_logo_guid
            [370] => php_sapi_name
            [371] => php_uname
            [372] => php_ini_scanned_files
            [373] => php_ini_loaded_file
            [374] => strnatcmp
            [375] => strnatcasecmp
            [376] => substr_count
            [377] => strspn
            [378] => strcspn
            [379] => strtok
            [380] => strtoupper
            [381] => strtolower
            [382] => strpos
            [383] => stripos
            [384] => strrpos
            [385] => strripos
            [386] => strrev
            [387] => hebrev
            [388] => hebrevc
            [389] => nl2br
            [390] => basename
            [391] => dirname
            [392] => pathinfo
            [393] => stripslashes
            [394] => stripcslashes
            [395] => strstr
            [396] => stristr
            [397] => strrchr
            [398] => str_shuffle
            [399] => str_word_count
            [400] => str_split
            [401] => strpbrk
            [402] => substr_compare
            [403] => strcoll
            [404] => substr
            [405] => substr_replace
            [406] => quotemeta
            [407] => ucfirst
            [408] => lcfirst
            [409] => ucwords
            [410] => strtr
            [411] => addslashes
            [412] => addcslashes
            [413] => rtrim
            [414] => str_replace
            [415] => str_ireplace
            [416] => str_repeat
            [417] => count_chars
            [418] => chunk_split
            [419] => trim
            [420] => ltrim
            [421] => strip_tags
            [422] => similar_text
            [423] => explode
            [424] => implode
            [425] => join
            [426] => setlocale
            [427] => localeconv
            [428] => soundex
            [429] => levenshtein
            [430] => chr
            [431] => ord
            [432] => parse_str
            [433] => str_getcsv
            [434] => str_pad
            [435] => chop
            [436] => strchr
            [437] => sprintf
            [438] => printf
            [439] => vprintf
            [440] => vsprintf
            [441] => fprintf
            [442] => vfprintf
            [443] => sscanf
            [444] => fscanf
            [445] => parse_url
            [446] => urlencode
            [447] =