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 loadResource
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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\Translation\Loader;
/**
 * PhpFileLoader loads translations from PHP files returning an array of translations.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
class PhpFileLoader extends FileLoader
{
    private static $cache = [];
    /**
     * {@inheritdoc}
     */
    protected function loadResource($resource)
    {
        if ([] === self::$cache && \function_exists('opcache_invalidate') && filter_var(ini_get('opcache.enable'), FILTER_VALIDATE_BOOLEAN) && (!\in_array(\PHP_SAPI, ['cli', 'phpdbg'], true) || filter_var(ini_get('opcache.enable_cli'), FILTER_VALIDATE_BOOLEAN))) {
            self::$cache = null;
        }
        if (null === self::$cache) {
            return require $resource;
        }
        if (isset(self::$cache[$resource])) {
            return self::$cache[$resource];
        }
        return self::$cache[$resource] = require $resource;
    }
}