PHP cross-domain problem solution

This article achieves cross-domain by setting Access-Control-Allow-Origin. For example: the client's domain name is client.php.cn, and the requested domain name is server.php.cn. If you use ajax to access it directly, you will get the following error:

XMLHttpRequest cannot load http:/server.php.cn/server.php. No 'Access-Control-Allow-Origin' header is present on the requested resource.Origin 'http://client.php.cn' is therefore not allowed access.

1. Allow single domain name access

specified For cross-domain access to a certain domain name (http://client.php.cn), you only need to add the following code to the header of the http://server.php.cn/server.php file:

<?php
header(&#39;Access-Control-Allow-Origin:http://client.php.cn&#39;);

2. Allow multiple domain names to access

If you specify multiple domain names (http://client1.php.cn, http://client2.php.cn, etc.) for cross-domain access, you only need to Add the following code to the header of the http://server.php.cn/server.php file:

<?php
$origin = isset($_SERVER[&#39;HTTP_ORIGIN&#39;])? $_SERVER[&#39;HTTP_ORIGIN&#39;] : &#39;&#39;;  
$allow_origin = array(  
    &#39;http://client1.php.cn&#39;,  
    &#39;http://client2.php.cn&#39;  
);

3. Allow all domain names to access

Allow all domain names to access Then just add the following code to the header of the http://server.php.cn/server.php file:

<?php
header(&#39;Access-Control-Allow-Origin:*&#39;);

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