文档介绍：Available free from ays array_intersect array_merge array_pop array_push array_reverse array_walk count in_array Date and Time date mktime strtotime time Filesystem clearstatcache copy fclose fgets file filemtime filesize file_exists fopen fread fwrite is_dir is_file readfile Headers header headers_sent setcookie Mail mail Numbers ceil floor number_format round Miscellaneous define eval exit Network fsockopen PHP Options ini_get ini_restore ini_set phpinfo Execution exec Regex ereg eregi ereg_replace eregi_replace split spliti preg_match preg_match_all preg_replace preg_split Sessions session_destroy session_id session_start Strings addslashes crypt echo explode implode md5 nl2br sprintf strip_tags stripslashes stristr strpos strrev strstr strtolower strtoupper str_replace substr trim URLs rawurldecode rawurlencode urldecode urlencode Variables empty is_array is_int is_null is_numeric is_object isset serialize unserialize SuperGlobals $_ENV $_GET $_POST $_COOKIE $_SESSION $_SERVER $_FILES $_REQUEST $GLOBALS Y y F M m n D l d j h g H G i s w z W t a A B S T Z O I L U c r 4 digit year 2 digit year Long month Short month Month (leading zeros) Month Short day name Long day name Day (leading zeros) Day 12 Hour (leading zeros) 12 Hour 24 Hour (leading zeros) 24 Hour Minutes (leading zeros) Seconds (leading zeros) Day of week Day of year Week of year Days in month Swatch Inte rnet