Self-Sealing Callable is a class that implements __invoke() which can enable and disable itself. When registering shutdown functions in PHP it's not possible to unregister them. This class exists to be used in this case. By calling SelfSealingCallable->disable() it will return false when invoked, allowing retroactive disabling of the shutdown handler.

Requirements

PHP 8.1

Installation

composer require mensbeam/self-sealing-callable

Usage

It's pretty simple:

use MensBeam\SelfSealingCallable;

$callable = new SelfSealingCallable(fn() => 'ook');
$ook = $callable();
// 'ook'
$callable->disable();
$ook = $callable();
// false
$callable->enable();
$ook = $callable();
// 'ook'