How Can I Execute PHP Code After Sending an HTTP Response?

Executing PHP After Response Dispatch

A PHP script often encounters the need to process data further after responding to a server request. One such scenario involves handling incoming message parameters ("ID_OF_MESSAGE" and "TEXT_OF_MESSAGE") and generating a response with "ANSWER_TO_ID" and "RESPONSE_MESSAGE" params.

However, sending an HTTP 200 response to the server will immediately mark the message as delivered on the server-side. This presents a dilemma as immediate response generation is essential.

To overcome this, you can:

ignore_user_abort(true); //optional
set_time_limit(0);

ob_start();
// Handle initial processing
echo $response; // Send the response
header('Connection: close');
header('Content-Length: '.ob_get_length());
ob_end_flush();
@ob_flush();
flush();
fastcgi_finish_request(); //required for PHP-FPM (PHP > 5.3.3)

// Continue processing after request dispatch
die(); // Ensure script termination

By setting ignore_user_abort() and set_time_limit(0), the script can continue executing indefinitely. The ob_* functions send the response headers and body immediately. The die() statement terminates the script, which is necessary to prevent infinite execution when set_time_limit(0) is used.

This technique allows you to handle incoming requests, send responses, and continue processing your PHP script without waiting for the browser to receive the full response.

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