PHP正则表达式从url中取得域名

以下代码可以从URL中获得域名

例如:http://souzz.net/html/database/ORACLE/69613.html

得到souzz.net

function get_domain($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); $endArr = array('com','net','org','3322');//com.cn; net.cn 等情况 if (in_array($arr[$count-2],$endArr)){ $domain = $arr[$count-3].'.'.$arr[$count-2].'.'.$arr[$count-1]; }else{ $domain =; $arr[$count-2].'.'.$arr[$count-1]; } return $domain; }// end if(!strcmp...) }// end if(count...)}// end function