PHP implements server-side to allow client-side ajax cross-domain

This article mainly talks about using PHP to implement server-side allowing client-side ajax cross-domain. Friends in need can refer to it.

The key to solving cross-domain issues is to set Access-Control-Allow-Origin.
For example: the client's domain name is api.itbsl.com, and the requested domain name is www.itbsl.com
If you use ajax to access it directly, there will be the following error: This article mainly talks about

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

1. Allow single domain name access
If you specify a domain name http://api.itbsl.com for cross-domain access, you only need to access it at http:// Add the following code to the header of the www.itbsl.com/server.php file:

header('Access-Control-Allow-Origin:http://api.itbsl.com');

2. Allow multiple domain names to access
Specify multiple domain names http://api.itbsl.com, http:/ /doc.itbsl.com and other cross-domain access, you only need to add the following code in the header of the http://www.itbsl.com/server.php file:

$origin = isset($_SERVER['HTTP_ORIGIN'])? $_SERVER['HTTP_ORIGIN'] : '';  
  
$allow_origin = array(  
    'http://api.itbsl.com',  
    'http://doc.itbsl.com'  
);  
  
if(in_array($origin, $allow_origin)){  
    header('Access-Control-Allow-Origin:'.$origin);       
}

3. Allow all domain names to access
To allow access from all domain names, just add the following code to the header of the http://www.itbsl.com/server.php file:

header('Access-Control-Allow-Origin:*');

Related videos: ajax video tutorial

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