具体代码如下：
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)){ if(isset($arr[$count-4])){ $domain = http://.$arr[$count-4]...$arr[$count-3]...$arr[$count-2]...$arr[$count-1]; }else{ $domain = $arr[$count-3]...$arr[$count-2]...$arr[$count-1]; } }else{ if(isset($arr[$count-3])){ $domain = http://.$arr[$count-3]...$arr[$count-2]...$arr[$count-1]; }else{ $domain = http://.$arr[$count-2]...$arr[$count-1]; } } return $domain; }// end if(!strcmp...) }// end if(count...) }// end functionecho get_domain(http://blog.csd.com.hk).
;echo get_domain(http://www.csd.net/www).
;echo get_domain(http://csd.net/).
;echo get_domain(http://csd.net/fdfdfd).
;
http://www.bkjia.com/phpjc/635053.htmlwww.bkjia.comtruehttp://www.bkjia.com/phpjc/635053.htmltecharticle具体代码如下： function get_domain($url){ $pattern = /[w-] .(com|net|org|gov|cc|biz|info|cn)(.(cn|hk))*/; preg_match($pattern, $url, $matches); if(count($matches) > 0) { r...