update php parse_url function

plus_parse_url.php

<?php 
// Update php parse_url function
// It determines that URL is a domain or IP  by is_ip
// Define clean site url without path
function plus_parse_url($url) {
    if(!preg_match("/^[a-zA-Z0-9]+$/", substr($url,0,1)))
        return false;
    if (strpos($url,"://")) {
        $parse = parse_url(strtolower($url));
        $parse['is_ip'] = (preg_match("/^[0-9]+$/",  substr($parse['host'],-1)))? true : false;
        if ($parse['scheme'] == 'http') {
            $parse['port'] = 80;
        } elseif ($parse['scheme'] == 'https') {
            $parse['port'] = 443;
        } else {
            $parse['port'] = 0;
        }
        $parse['site_url'] = $parse['scheme'].'://'.$parse['host'];
        return $parse;
    }
    $url = "non-protocol://".$url;
    $parse = parse_url(strtolower($url));
    $parse['port'] = 0;
    $parse['is_ip'] = (preg_match("/^[0-9]+$/",  substr($parse['host'],-1)))? true : false;
    if (isset($parse['path']) || !$parse['is_ip']) {
        $parse['site_url'] = 'http://'.$parse['host'];
        $parse['port'] = 80;
    }
    return $parse;
}
?>