Php get root domain name method summary _ PHP Tutorial

Php obtains the summary of root domain names. Php obtains the root domain name summary. if you only get the domain name currently accessing your page, you only need to use the HTTP_HOST function in php, if the root domain name of the extracted url is php, the method for obtaining the root domain name is summarized.

If you only get the domain name currently accessing your page, you only need to use the HTTP_HOST function in php. if you want to extract the url root domain name, you need regular expressions, let's take a look at several specific instances.

It is very easy to obtain the current domain name:

The code is as follows:

　　

// Obtain the current domain name:

Echo $ _ SERVER ['server _ name'];

// Obtain the source URL, that is, click the previous URL on this page.

Echo $ _ SERVER ["HTTP_REFERER"];

$ _ SERVER ['request _ URI ']; // Obtain the suffix of the current domain name

$ _ SERVER ['http _ host']; // Obtain the current domain name

Dirname (_ FILE _); // Obtain the physical path of the current FILE

Dirname (_ FILE _). "/../"; // Obtain the upper-level physical path of the current FILE

?>

Example 1

The code is as follows:

Function getUrlRoot ($ url ){

# Add the header and tail

$ Url = $ url ."/";

# Determining domain names

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 );

# Determining IP addresses

If ($ ohurl [3] = ''){

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

Return $ ohip [1];

}

Return $ ohurl [3];

}

Example 2

The code is as follows:

/**

* Get the root domain name

* @ Param type $ domain name

* @ Return string returns the 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;

}

If you only get the domain name currently accessing your page, you only need to use the HTTP_HOST function in php. if you want to extract the url root domain name, you can do it...