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Editing: SerializationTrait.php

<?php
/*
 * Copyright 2017 Google LLC
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
namespace Google\ApiCore\Testing;

use Google\Protobuf\Internal\Message;

/**
 * @internal
 */
trait SerializationTrait
{
    /**
     * @param mixed $message
     * @param mixed $deserialize
     */
    protected function deserializeMessage($message, $deserialize)
    {
        if ($message === null) {
            return null;
        }

if ($deserialize === null) {
            return $message;
        }

// Proto3 implementation
        if (is_array($deserialize)) {
            list($className, $deserializeFunc) = $deserialize;
            /** @var Message $obj */
            $obj = new $className();
            if (method_exists($obj, $deserializeFunc)) {
                $obj->$deserializeFunc($message);
            } elseif (is_string($message)) {
                $obj->mergeFromString($message);
            }

return $obj;
        }

// Protobuf-PHP implementation
        return call_user_func($deserialize, $message);
    }
}

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