How PHP+AJAX realizes cross-domain

PHP file code [I am using PHPCMS as an example]

Add a mobile folder [module] under the phpcms\modules folder; add an index.php file under the module, The code is as follows:

/**
public function test()
{
//Load database model
$mb_start_db = pc_base::load_model('mb_start_model');
$where = array('id'=> 1);
$data = ('pic1,pic2,pic3');
$res = $mb_start_db->get_one($where, $data);

if($res)
                                                                                                                                                                                                                                                   if(!empty($_GET['callback'])) result'=>$res);
                                                                                       echo $_GET['callback']. '('.json_encode($json_arr).')'; ('status'=>1,'msg'=>'Success!','result'=>$res);
          echo json_encode($json_arr);die;
      }
      }

}
This is a complete code
**/


Note: The above code has a $_GET['callback'] , this is a parameter of jsonp;

Look at the code of the HTML5 page:

##The final rendering is as follows:

But if you click the Get Data button [Note: The name of the button should be Get Data, sorry for the typo], the following error will appear:

This error is not allowed, or cross-domain is prohibited. The solution is very simple. Add a piece of code to the head of the PHP file:

/ **

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

* indicates that all domain names can be accessed
**/

After adding the above code, the final effect is as follows:

If dataType:'jsonp', Look at the PHP code in the picture below

:

The result is as follows:

Briefly summarize 2 points:

1. Use jsonp when making Ajax requests, and then also bring jsonp data when receiving and returning from PHP;

2. Only provided to To use a browser that supports HTML5, you only need to add the following two sentences to the header of PHP

header("Access-Control-Allow-Origin:*"); //* means all Domain names can be accessed

header("Access-Control-Allow-Method:POST,GET");

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