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Editing: ReturnCallback.php

<?php
/*
 * This file is part of the PHPUnit_MockObject package.
 *
 * (c) Sebastian Bergmann <sebastian@phpunit.de>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

/**
 * @since Class available since Release 1.0.0
 */
class PHPUnit_Framework_MockObject_Stub_ReturnCallback implements PHPUnit_Framework_MockObject_Stub
{
    protected $callback;

public function __construct($callback)
    {
        $this->callback = $callback;
    }

public function invoke(PHPUnit_Framework_MockObject_Invocation $invocation)
    {
        return call_user_func_array($this->callback, $invocation->parameters);
    }

public function toString()
    {
        if (is_array($this->callback)) {
            if (is_object($this->callback[0])) {
                $class = get_class($this->callback[0]);
                $type  = '->';
            } else {
                $class = $this->callback[0];
                $type  = '::';
            }

return sprintf(
                'return result of user defined callback %s%s%s() with the ' .
                'passed arguments',
                $class,
                $type,
                $this->callback[1]
            );
        } else {
            return 'return result of user defined callback ' . $this->callback .
                   ' with the passed arguments';
        }
    }
}

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