The register_shutdown_function Function

The register_shutdown_function function allows registering a callback function that will be executed when the script terminates or on a fatal error. The first parameter is the function name or an anonymous function, subsequent parameters (optional) are arguments for this function.

Syntax

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

Example

Simple function registration on termination:

<?php
	function shutdown() {
		echo 'Script finished';
	}
	
	register_shutdown_function('shutdown');
	echo 'Script running...';
?>

Execution result:

Script running...Script finished

Example

Using an anonymous function:

<?php
	register_shutdown_function(function() {
		echo 'Cleanup completed';
	});
	
	echo 'Main operations...';
?>

Execution result:

Main operations...Cleanup completed

Example

Passing arguments to the shutdown function:

<?php
	function logShutdown($message) {
		echo $message;
	}
	
	register_shutdown_function('logShutdown', 'Script shutdown at: ' . date('H:i:s'));
	echo 'Processing data...';
?>

Execution result:

Processing data...Script shutdown at: [current_time]

The register_shutdown_function Function

Syntax

Example

Example

Example

See Also