common_inc_php是什么，它在PHP中有什么作用？

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1.[代码] [PHP] 引入文件

require mysql.php; require db.php; // 数据库连接信息 $db_host=localhost; $db_name=myccs; $db_user=root; $db_pwd=root; $db_charset=gbk; db_connect($db_host, $db_name, $db_user, $db_pwd, $db_charset);

1.[代码][PHP]代码

<?php require "mysql.php"; require "db.php"; //数据库连接信息 $db_host = "localhost"; $db_name = "myccs"; $db_user = "root"; $db_pwd = "root"; $db_charset = "gbk"; db_connect($db_host ,$db_name ,$db_user ,$db_pwd,$db_charset); //设置路径常量 define('DB_HOST', $db_host); define('DB_USER', $db_user); define('DB_PASSWORD', $db_pwd); define('DB_NAME', $db_name); $db = new DbClass(); $sql = "SET NAMES 'gbk'"; $db->query($sql); //截取URL中的域名, 不包括前缀(子域名) function TrackDomain2($url) { $pattern = "/[\w-]+\.(com|net|org|gov|cc|biz|info|cn)(\.(cn|hk))*/"; preg_match($pattern, $url, $matches); if(count($matches) > 0) { return $matches[0]; }else { $rs = parse_url($url); $main_url = $rs["host"]; if(!strcmp(long2ip(sprintf("%u",ip2long($main_url))),$main_url)) { return $main_url; }else { $arr = explode(".",$main_url); $count=count($arr); $endArr = array("com","net","org","3322"); if (in_array($arr[$count-2],$endArr)) { $domain = $arr[$count-3].".".$arr[$count-2].".".$arr[$count-1]; }else { $domain = $arr[$count-2].".".$arr[$count-1]; } return $domain; } } } ?>