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Edit File: Reference.php

<?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\DependencyInjection;

/**
 * Reference represents a service reference.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
class Reference
{
    private $id;
    private $invalidBehavior;
    private $strict;

/**
     * Note: The $strict parameter is deprecated since version 2.8 and will be removed in 3.0.
     *
     * @param string $id              The service identifier
     * @param int    $invalidBehavior The behavior when the service does not exist
     * @param bool   $strict          Sets how this reference is validated
     *
     * @see Container
     */
    public function __construct($id, $invalidBehavior = ContainerInterface::EXCEPTION_ON_INVALID_REFERENCE, $strict = true)
    {
        $this->id = strtolower($id);
        $this->invalidBehavior = $invalidBehavior;
        $this->strict = $strict;
    }

/**
     * @return string The service identifier
     */
    public function __toString()
    {
        return $this->id;
    }

/**
     * Returns the behavior to be used when the service does not exist.
     *
     * @return int
     */
    public function getInvalidBehavior()
    {
        return $this->invalidBehavior;
    }

/**
     * Returns true when this Reference is strict.
     *
     * @return bool
     *
     * @deprecated since version 2.8, to be removed in 3.0.
     */
    public function isStrict($triggerDeprecationError = true)
    {
        if ($triggerDeprecationError) {
            @trigger_error('The '.__METHOD__.' method is deprecated since version 2.8 and will be removed in 3.0.', E_USER_DEPRECATED);
        }

return $this->strict;
    }
}