register_shutdown_function()

register_shutdown_function() — Register a function for execution on shutdown.

Built-in function of PHP 8.5. The manual lists it as available in PHP 4, PHP 5, PHP 7, PHP 8. This page is the reference card: signature, parameters and return value, plus the changelog and the example the manual provides.

What it does

Registers a callback to be executed after script execution finishes or exit() is called.

Signature

register_shutdown_function(callable $callback, mixed ...$args): void

Parameters

Parameter	Type	What it takes
$callback	callable	The shutdown callback to register.
...$args	mixed	It is possible to pass parameters to the shutdown function by passing additional parameters.

Return value

No value is returned.

Example

A runnable snippet:

function shutdown() { // This is our shutdown function, in // here we can do any last operations // before the script is complete. echo 'Script executed with success', PHP_EOL; } register_shutdown_function('shutdown');