run(); * * @final */ class TaskQueue implements TaskQueueInterface { private $enableShutdown = true; private $queue = []; public function __construct(bool $withShutdown = true) { if ($withShutdown) { register_shutdown_function(function (): void { if ($this->enableShutdown) { // Only run the tasks if an E_ERROR didn't occur. $err = error_get_last(); if (!$err || ($err['type'] ^ E_ERROR)) { $this->run(); } } }); } } public function isEmpty(): bool { return !$this->queue; } public function add(callable $task): void { $this->queue[] = $task; } public function run(): void { while ($task = array_shift($this->queue)) { /** @var callable $task */ $task(); } } /** * The task queue will be run and exhausted by default when the process * exits IFF the exit is not the result of a PHP E_ERROR error. * * You can disable running the automatic shutdown of the queue by calling * this function. If you disable the task queue shutdown process, then you * MUST either run the task queue (as a result of running your event loop * or manually using the run() method) or wait on each outstanding promise. * * Note: This shutdown will occur before any destructors are triggered. */ public function disableShutdown(): void { $this->enableShutdown = false; } }