Deferred

Overview:

Deferred executes a callback when the object is destroyed. This is a lightweight deferral mechanism for cleanup logic.

Use Deferred to guarantee cleanup actions run at scope end, such as releasing locks, flushing buffers, or writing final telemetry.

Public API:

• new Deferred(callable $callback) registers a callback.
• Deferred::disarm() disables the callback.
• Deferred::prime() re-enables the callback.

Example:

$defer = new Deferred(function () {
  echo "cleanup";
});

The Deferred class ensure deferred execution of code, even in case of fatal error.

Run code at function end or in case of error.

---

The passed callback will be queued for execution on Deferred object destruction.

function duel(){
	echo "A: I will have the last word!\n";

	echo "B: Wanna bet?\n";

	$defer_B_last_word = new Deferred(function(){
		echo "B: Haha! Gotcha!\n";
	});
	
	die("A: I WIN!\n"); // Hahaha!

	echo "B: WUT?\n";
}

duel();

A: I will have the last word!
B: Wanna bet?
A: I WIN!
B: Haha! Gotcha!