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] => strtotime
            [54] => date
            [55] => idate
            [56] => gmdate
            [57] => mktime
            [58] => gmmktime
            [59] => checkdate
            [60] => strftime
            [61] => gmstrftime
            [62] => time
            [63] => localtime
            [64] => getdate
            [65] => date_create
            [66] => date_create_immutable
            [67] => date_create_from_format
            [68] => date_create_immutable_from_format
            [69] => date_parse
            [70] => date_parse_from_format
            [71] => date_get_last_errors
            [72] => date_format
            [73] => date_modify
            [74] => date_add
            [75] => date_sub
            [76] => date_timezone_get
            [77] => date_timezone_set
            [78] => date_offset_get
            [79] => date_diff
            [80] => date_time_set
            [81] => date_date_set
            [82] => date_isodate_set
            [83] => date_timestamp_set
            [84] => date_timestamp_get
            [85] => timezone_open
            [86] => timezone_name_get
            [87] => timezone_name_from_abbr
            [88] => timezone_offset_get
            [89] => timezone_transitions_get
            [90] => timezone_location_get
            [91] => timezone_identifiers_list
            [92] => timezone_abbreviations_list
            [93] => timezone_version_get
            [94] => date_interval_create_from_date_string
            [95] => date_interval_format
            [96] => date_default_timezone_set
            [97] => date_default_timezone_get
            [98] => date_sunrise
            [99] => date_sunset
            [100] => date_sun_info
            [101] => ereg
            [102] => ereg_replace
            [103] => eregi
            [104] => eregi_replace
            [105] => split
            [106] => spliti
            [107] => sql_regcase
            [108] => libxml_set_streams_context
            [109] => libxml_use_internal_errors
            [110] => libxml_get_last_error
            [111] => libxml_clear_errors
            [112] => libxml_get_errors
            [113] => libxml_disable_entity_loader
            [114] => libxml_set_external_entity_loader
            [115] => openssl_get_cert_locations
            [116] => openssl_spki_new
            [117] => openssl_spki_verify
            [118] => openssl_spki_export
            [119] => openssl_spki_export_challenge
            [120] => openssl_pkey_free
            [121] => openssl_pkey_new
            [122] => openssl_pkey_export
            [123] => openssl_pkey_export_to_file
            [124] => openssl_pkey_get_private
            [125] => openssl_pkey_get_public
            [126] => openssl_pkey_get_details
            [127] => openssl_free_key
            [128] => openssl_get_privatekey
            [129] => openssl_get_publickey
            [130] => openssl_x509_read
            [131] => openssl_x509_free
            [132] => openssl_x509_parse
            [133] => openssl_x509_checkpurpose
            [134] => openssl_x509_check_private_key
            [135] => openssl_x509_export
            [136] => openssl_x509_fingerprint
            [137] => openssl_x509_export_to_file
            [138] => openssl_pkcs12_export
            [139] => openssl_pkcs12_export_to_file
            [140] => openssl_pkcs12_read
            [141] => openssl_csr_new
            [142] => openssl_csr_export
            [143] => openssl_csr_export_to_file
            [144] => openssl_csr_sign
            [145] => openssl_csr_get_subject
            [146] => openssl_csr_get_public_key
            [147] => openssl_digest
            [148] => openssl_encrypt
            [149] => openssl_decrypt
            [150] => openssl_cipher_iv_length
            [151] => openssl_sign
            [152] => openssl_verify
            [153] => openssl_seal
            [154] => openssl_open
            [155] => openssl_pbkdf2
            [156] => openssl_pkcs7_verify
            [157] => openssl_pkcs7_decrypt
            [158] => openssl_pkcs7_sign
            [159] => openssl_pkcs7_encrypt
            [160] => openssl_private_encrypt
            [161] => openssl_private_decrypt
            [162] => openssl_public_encrypt
            [163] => openssl_public_decrypt
            [164] => openssl_get_md_methods
            [165] => openssl_get_cipher_methods
            [166] => openssl_dh_compute_key
            [167] => openssl_random_pseudo_bytes
            [168] => openssl_error_string
            [169] => preg_match
            [170] => preg_match_all
            [171] => preg_replace
            [172] => preg_replace_callback
            [173] => preg_filter
            [174] => preg_split
            [175] => preg_quote
            [176] => preg_grep
            [177] => preg_last_error
            [178] => readgzfile
            [179] => gzrewind
            [180] => gzclose
            [181] => gzeof
            [182] => gzgetc
            [183] => gzgets
            [184] => gzgetss
            [185] => gzread
            [186] => gzopen
            [187] => gzpassthru
            [188] => gzseek
            [189] => gztell
            [190] => gzwrite
            [191] => gzputs
            [192] => gzfile
            [193] => gzcompress
            [194] => gzuncompress
            [195] => gzdeflate
            [196] => gzinflate
            [197] => gzencode
            [198] => gzdecode
            [199] => zlib_encode
            [200] => zlib_decode
            [201] => zlib_get_coding_type
            [202] => ob_gzhandler
            [203] => bcadd
            [204] => bcsub
            [205] => bcmul
            [206] => bcdiv
            [207] => bcmod
            [208] => bcpow
            [209] => bcsqrt
            [210] => bcscale
            [211] => bccomp
            [212] => bcpowmod
            [213] => ctype_alnum
            [214] => ctype_alpha
            [215] => ctype_cntrl
            [216] => ctype_digit
            [217] => ctype_lower
            [218] => ctype_graph
            [219] => ctype_print
            [220] => ctype_punct
            [221] => ctype_space
            [222] => ctype_upper
            [223] => ctype_xdigit
            [224] => curl_init
            [225] => curl_copy_handle
            [226] => curl_version
            [227] => curl_setopt
            [228] => curl_setopt_array
            [229] => curl_exec
            [230] => curl_getinfo
            [231] => curl_error
            [232] => curl_errno
            [233] => curl_close
            [234] => curl_strerror
            [235] => curl_multi_strerror
            [236] => curl_reset
            [237] => curl_escape
            [238] => curl_unescape
            [239] => curl_pause
            [240] => curl_multi_init
            [241] => curl_multi_add_handle
            [242] => curl_multi_remove_handle
            [243] => curl_multi_select
            [244] => curl_multi_exec
            [245] => curl_multi_getcontent
            [246] => curl_multi_info_read
            [247] => curl_multi_close
            [248] => curl_multi_setopt
            [249] => curl_share_init
            [250] => curl_share_close
            [251] => curl_share_setopt
            [252] => curl_file_create
            [253] => dom_import_simplexml
            [254] => finfo_open
            [255] => finfo_close
            [256] => finfo_set_flags
            [257] => finfo_file
            [258] => finfo_buffer
            [259] => mime_content_type
            [260] => filter_input
            [261] => filter_var
            [262] => filter_input_array
            [263] => filter_var_array
            [264] => filter_list
            [265] => filter_has_var
            [266] => filter_id
            [267] => ftp_connect
            [268] => ftp_ssl_connect
            [269] => ftp_login
            [270] => ftp_pwd
            [271] => ftp_cdup
            [272] => ftp_chdir
            [273] => ftp_exec
            [274] => ftp_raw
            [275] => ftp_mkdir
            [276] => ftp_rmdir
            [277] => ftp_chmod
            [278] => ftp_alloc
            [279] => ftp_nlist
            [280] => ftp_rawlist
            [281] => ftp_systype
            [282] => ftp_pasv
            [283] => ftp_get
            [284] => ftp_fget
            [285] => ftp_put
            [286] => ftp_fput
            [287] => ftp_size
            [288] => ftp_mdtm
            [289] => ftp_rename
            [290] => ftp_delete
            [291] => ftp_site
            [292] => ftp_close
            [293] => ftp_set_option
            [294] => ftp_get_option
            [295] => ftp_nb_fget
            [296] => ftp_nb_get
            [297] => ftp_nb_continue
            [298] => ftp_nb_put
            [299] => ftp_nb_fput
            [300] => ftp_quit
            [301] => gd_info
            [302] => imagearc
            [303] => imageellipse
            [304] => imagechar
            [305] => imagecharup
            [306] => imagecolorat
            [307] => imagecolorallocate
            [308] => imagepalettecopy
            [309] => imagecreatefromstring
            [310] => imagecolorclosest
            [311] => imagecolorclosesthwb
            [312] => imagecolordeallocate
            [313] => imagecolorresolve
            [314] => imagecolorexact
            [315] => imagecolorset
            [316] => imagecolortransparent
            [317] => imagecolorstotal
            [318] => imagecolorsforindex
            [319] => imagecopy
            [320] => imagecopymerge
            [321] => imagecopymergegray
            [322] => imagecopyresized
            [323] => imagecreate
            [324] => imagecreatetruecolor
            [325] => imageistruecolor
            [326] => imagetruecolortopalette
            [327] => imagepalettetotruecolor
            [328] => imagesetthickness
            [329] => imagefilledarc
            [330] => imagefilledellipse
            [331] => imagealphablending
            [332] => imagesavealpha
            [333] => imagecolorallocatealpha
            [334] => imagecolorresolvealpha
            [335] => imagecolorclosestalpha
            [336] => imagecolorexactalpha
            [337] => imagecopyresampled
            [338] => imagerotate
            [339] => imageflip
            [340] => imageantialias
            [341] => imagecrop
            [342] => imagecropauto
            [343] => imagescale
            [344] => imageaffine
            [345] => imageaffinematrixconcat
            [346] => imageaffinematrixget
            [347] => imagesetinterpolation
            [348] => imagesettile
            [349] => imagesetbrush
            [350] => imagesetstyle
            [351] => imagecreatefrompng
            [352] => imagecreatefromgif
            [353] => imagecreatefromjpeg
            [354] => imagecreatefromwbmp
            [355] => imagecreatefromxbm
            [356] => imagecreatefromgd
            [357] => imagecreatefromgd2
            [358] => imagecreatefromgd2part
            [359] => imagepng
            [360] => imagegif
            [361] => imagejpeg
            [362] => imagewbmp
            [363] => imagegd
            [364] => imagegd2
            [365] => imagedestroy
            [366] => imagegammacorrect
            [367] => imagefill
            [368] => imagefilledpolygon
            [369] => imagefilledrectangle
            [370] => imagefilltoborder
            [371] => imagefontwidth
            [372] => imagefontheight
            [373] => imageinterlace
            [374] => imageline
            [375] => imageloadfont
            [376] => imagepolygon
            [377] => imagerectangle
            [378] => imagesetpixel
            [379] => imagestring
            [380] => imagestringup
            [381] => imagesx
            [382] => imagesy
            [383] => imagedashedline
            [384] => imagettfbbox
            [385] => imagettftext
            [386] => imageftbbox
            [387] => imagefttext
            [388] => imagetypes
            [389] => jpeg2wbmp
            [390] => png2wbmp
            [391] => image2wbmp
            [392] => imagelayereffect
            [393] => imagexbm
            [394] => imagecolormatch
            [395] => imagefilter
            [396] => imageconvolution
            [397] => textdomain
            [398] => gettext
            [399] => _
            [400] => dgettext
            [401] => dcgettext
            [402] => bindtextdomain
            [403] => ngettext
            [404] => dngettext
            [405] => dcngettext
            [406] => bind_textdomain_codeset
            [407] => hash
            [408] => hash_file
            [409] => hash_hmac
            [410] => hash_hmac_file
            [411] => hash_init
            [412] => hash_update
            [413] => hash_update_stream
            [414] => hash_update_file
            [415] => hash_final
            [416] => hash_copy
            [417] => hash_algos
            [418] => hash_pbkdf2
            [419] => hash_equals
            [420] => mhash_keygen_s2