How to Maintain PHP Execution After Sending an HTTP Response?

Maintaining PHP Execution After HTTP Response

Maintaining PHP execution beyond the HTTP response requires special considerations, particularly in environments like mod_php. To address this challenge, the following solution is presented:

To send an HTTP response while continuing PHP execution, you can leverage the following code snippet:

<?php
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(); // Enable strange behavior
flush();            // Required for behavior to work
session_write_close(); // Suggested enhancement to ensure session data is saved
// Perform processing here
sleep(30);
echo('Text user will never see');
?>

This code performs the following steps:

1. Cleans the output buffer.
2. Sets the "Connection: close" header to terminate the HTTP connection.
3. Ignores any user attempts to abort the script (optional).
4. Starts a new output buffer to capture any remaining output.
5. Outputs a message to the user (which will be displayed immediately).
6. Calculates the length of the output buffer and sets the "Content-Length" header.
7. Flushes the output buffer to send the response headers and message to the client.
8. Closes the session to ensure any changes made are saved.
9. Executes any necessary processing, which can take up to one minute.
10. Outputs any additional messages or results (these will not be sent to the client).

The above is the detailed content of How to Maintain PHP Execution After Sending an HTTP Response?. For more information, please follow other related articles on the PHP Chinese website!