SignalMap.php
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SignalMap.php
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	<?php

	/*
	* This file is part of the Symfony package.
	*
	* (c) Fabien Potencier <fabien@symfony.com>
	*
	* For the full copyright and license information, please view the LICENSE
	* file that was distributed with this source code.
	*/

	namespace Symfony\Component\Console\SignalRegistry;

	/**
	* @author Grégoire Pineau <lyrixx@lyrixx.info>
	*/
	class SignalMap
	{
	private static array $map;

	public static function getSignalName(int $signal): ?string
	{
	if (!\extension_loaded('pcntl')) {
	return null;
	}

	if (!isset(self::$map)) {
	$r = new \ReflectionExtension('pcntl');
	$c = $r->getConstants();
	$map = array_filter($c, fn ($k) => str_starts_with($k, 'SIG') && !str_starts_with($k, 'SIG_') && 'SIGBABY' !== $k, \ARRAY_FILTER_USE_KEY);
	self::$map = array_flip($map);
	}

	return self::$map[$signal] ?? null;
	}
	}