How Can I Securely Detect AJAX Requests in PHP?

How to Securely Detect AJAX Requests in PHP

Detecting AJAX requests on the server is crucial for ensuring the security and integrity of your PHP applications. This is because conventional methods, such as checking for a specific GET parameter or a custom header, can be easily bypassed by hackers.

Secure Detection Method

To reliably verify AJAX requests, consider the following approach:

<code class="php">if(strtolower($_SERVER['HTTP_X_REQUESTED_WITH'] ?? '') === 'xmlhttprequest')
{    
    // We can assume that request was made with AJAX   
}</code>

This method checks if the HTTP_X_REQUESTED_WITH parameter is present and its value is xmlhttprequest. This header is sent by modern browsers when making AJAX requests. By using this technique, you can confidently distinguish between regular and AJAX requests, ensuring the security and reliability of your application.

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