Fix PHP Cross-Domain Requests

Cross-origin request refers to the situation where the content running on a web page interacts with resources from a different domain. To address the PHP cross-origin request issue, several methods can be adopted:

1. Utilizing CORS (Cross-Origin Resource Sharing): Setting response headers in PHP code to allow requests from specific sources. Cross-origin requests can be achieved by setting response headers such as Access-Control-Allow-Origin, Access-Control-Allow-Headers, and Access-Control-Allow-Methods.

header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: GET, POST, PUT, DELETE, OPTIONS');
header('Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept');

1. Utilize JSONP (JSON with Padding): JSONP is a method of fetching data across domains using the script tag. In PHP, you can return data in JSONP format, and the frontend can retrieve the data by dynamically creating a script tag.

$callback = $_GET['callback'];
$data = array('message' => 'Hello, World!');
echo $callback . '(' . json_encode($data) . ')';

1. Utilizing a proxy server: Send the cross-origin request to the proxy server, which forwards the request and returns the data. This allows bypassing the browser’s same-origin policy and achieving cross-origin requests.

The above are several common methods to solve the issue of PHP cross-origin requests. Choose the appropriate method based on the specific situation.