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Home > Article > Backend Development > Method to extract complete subdomain name from string -php_PHP tutorial
The specific code is as follows:
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 function echo get_domain("http://blog.csd.com.hk")."<br/>"; echo get_domain("http://www.csd.net/www")."<br/>"; echo get_domain("http://csd.net/")."<br/>"; echo get_domain("http://csd.net/fdfdfd")."<br/>";