Invoker.php
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Invoker.php
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	<?php declare(strict_types=1);
	/*
	* This file is part of phpunit/php-invoker.
	*
	* (c) Sebastian Bergmann <sebastian@phpunit.de>
	*
	* For the full copyright and license information, please view the LICENSE
	* file that was distributed with this source code.
	*/
	namespace SebastianBergmann\Invoker;

	use const SIGALRM;
	use function call_user_func_array;
	use function function_exists;
	use function pcntl_alarm;
	use function pcntl_async_signals;
	use function pcntl_signal;
	use function sprintf;
	use Throwable;

	final class Invoker
	{
	/**
	* @var int
	*/
	private $timeout;

	/**
	* @throws Throwable
	*/
	public function invoke(callable $callable, array $arguments, int $timeout)
	{
	if (!$this->canInvokeWithTimeout()) {
	throw new ProcessControlExtensionNotLoadedException(
	'The pcntl (process control) extension for PHP is required'
	);
	}

	pcntl_signal(
	SIGALRM,
	function (): void {
	throw new TimeoutException(
	sprintf(
	'Execution aborted after %d second%s',
	$this->timeout,
	$this->timeout === 1 ? '' : 's'
	)
	);
	},
	true
	);

	$this->timeout = $timeout;

	pcntl_async_signals(true);
	pcntl_alarm($timeout);

	try {
	return call_user_func_array($callable, $arguments);
	} finally {
	pcntl_alarm(0);
	}
	}

	public function canInvokeWithTimeout(): bool
	{
	return function_exists('pcntl_signal') && function_exists('pcntl_async_signals') && function_exists('pcntl_alarm');
	}
	}