How to Run PHP Operations After Sending an HTTP Response?

Executing PHP Operations Post HTTP Response Sending

In PHP 5.2, when running as mod_php, sending an HTTP response can interrupt long-running database requests and email processing. To address this issue, one can utilize a technique that allows PHP to send a complete HTTP response to the client and then continue executing operations for an additional duration.

The following snippet accomplishes this:

ob_end_clean();
header("Connection: close");
ignore_user_abort(); // optional
ob_start();
echo ('Text the user will see');
$size = ob_get_length();
header("Content-Length: $size");
ob_end_flush(); // Strange behaviour, will not work
flush();            // Unless both are called !
session_write_close(); // Added a line suggested in the comment
// Do processing here 
sleep(30);
echo('Text user will never see');

Upon execution, the script immediately sends a complete HTTP response to the client. It then commences processing the database requests and emails in the background, which can take up to a minute. Note that user interaction will be cut off once the response is sent.

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