Yii2 Legacy MongoRegex, MongoId implementation for backward compatibility with php < 7.0

MongoId.php

<?php
use MongoDB\BSON\ObjectID;

/**
 * Legacy MongoId implementation for backward compatibility with php < 7.0
 * Usage: add this to entry script
 * if (version_compare(phpversion(), '7.0.0', '>')) {
 *   // php v7 uses different MongoDB classes
 *   Yii::$classMap['MongoId'] = '@app/components/MongoId.php';
 * }
 */
class MongoId
{
    private $mongoId;

    public function __construct($id)
    {
        $this->mongoId = new \MongoDB\BSON\ObjectID($id);
        return $this->mongoId;
    }

    public function __toString()
    {
        return $this->mongoId->__toString();
    }
}

MongoRegex.php

<?php

use MongoDB\BSON\Regex;

/**
 * Legacy MongoRegex implementation for backward compatibility with php < 7.0
 * Usage: add this to entry script
 * if (version_compare(phpversion(), '7.0.0', '>')) {
 *   // php v7 uses different MongoDB classes
 *   Yii::$classMap['MongoRegex'] = '@app/components/MongoRegex.php';
 * }
 */
class MongoRegex implements MongoDB\BSON\Type
{
    private $regex;

    public function __construct($pattern)
    {
        $this->regex = new \MongoDB\BSON\Regex($pattern, null);
        return $this->regex;
    }

    public function getFlags()
    {
        return $this->regex->getFlags();
    }

    public function getPattern()
    {
        return $this->regex->getPattern();
    }

    public function __toString()
    {
        return $this->regex->__toString();
    }
}