php Get Root Domain Name Method Summary

This paper summarizes the method of obtaining root domain name by php, and shares it with you for your reference. The specific implementation method is as follows:

If you simply get the domain name currently visiting your page, we only need to use the function HTTP_HOST in php. If it is regular to extract the root domain name of url, let's take a look at several specific examples.

It is very simple to get the current domain name:

<?php

// Get the current domain name :

echo $_SERVER['SERVER_NAME'];

// Get the source URL , That is, click to the previous website of this page 

echo $_SERVER["HTTP_REFERER"];

$_SERVER['REQUEST_URI'];// Gets the suffix of the current domain name 

$_SERVER['HTTP_HOST'];// Get the current domain name 

dirname(__FILE__);// Gets the physical path of the current file 

dirname(__FILE__)."/../";// Object of the current file 1 Level physical path 

?>

Example 1

function getUrlRoot($url){

        # Add Head and Tail 

        $url = $url . "/";

        # Judge domain name 

        preg_match("/((\w*):\/\/)?\w*\.?([\w|-]*\.(com.cn|net.cn|gov.cn|org.cn|com|net|cn|org|asia|tel|mobi|me|tv|biz|cc|name|info))

\//", $url, $ohurl);

        # Judge IP

        if($ohurl[3] == ''){

                preg_match("/((\d+\.){3}\d+)\//", $url, $ohip);

                return $ohip[1];

        }

        return $ohurl[3];

}

Example 2

/**

 *  Get the root domain name 

 * @param type $domain  Domain name 

 * @return string  Return to Root Domain Name 

 */

function GetUrlToDomain($domain) {

    $re_domain = '';

    $domain_postfix_cn_array = array("com", "net", "org", "gov", "edu", "com.cn", "cn");

    $array_domain = explode(".", $domain);

    $array_num = count($array_domain) - 1;

    if ($array_domain[$array_num] == 'cn') {

        if (in_array($array_domain[$array_num - 1], $domain_postfix_cn_array)) {

            $re_domain = $array_domain[$array_num - 2] . "." . $array_domain[$array_num - 1] . "." . $array_domain[$array_num];

        } else {

            $re_domain = $array_domain[$array_num - 1] . "." . $array_domain[$array_num];

        }

    } else {

        $re_domain = $array_domain[$array_num - 1] . "." . $array_domain[$array_num];

    }

    return $re_domain;

}

I hope this article is helpful to everyone's php programming.