lithium\util\Set::append PHP Method

    public static function append(array $array, array $array2)
    {
        $arrays = func_get_args();
        $array = array_shift($arrays);
        foreach ($arrays as $array2) {
            if (!$array && $array2) {
                $array = $array2;
                continue;
            }
            foreach ($array2 as $key => $value) {
                if (!array_key_exists($key, $array)) {
                    $array[$key] = $value;
                } elseif (is_array($value)) {
                    $array[$key] = static::append($array[$key], $array2[$key]);
                }
            }
        }
        return $array;
    }

	public function testAppend() {
		$array1 = array('ModelOne' => array(
			'id' => 1001, 'field_one' => 'a1.m1.f1', 'field_two' => 'a1.m1.f2'
		));
		$array2 = array('ModelTwo' => array(
			'id' => 1002, 'field_one' => 'a2.m2.f1', 'field_two' => 'a2.m2.f2'
		));

		$result = Set::append($array1, $array2);

		$this->assertIdentical($result, $array1 + $array2);

		$array3 = array('ModelOne' => array(
			'id' => 1003, 'field_one' => 'a3.m1.f1',
			'field_two' => 'a3.m1.f2', 'field_three' => 'a3.m1.f3'
		));
		$result = Set::append($array1, $array3);

		$expected = array('ModelOne' => array(
			'id' => 1001, 'field_one' => 'a1.m1.f1',
			'field_two' => 'a1.m1.f2', 'field_three' => 'a3.m1.f3'
		));
		$this->assertIdentical($expected, $result);

		$array1 = array(
			array('ModelOne' => array(
				'id' => 1001, 'field_one' => 's1.0.m1.f1', 'field_two' => 's1.0.m1.f2'
			)),
			array('ModelTwo' => array(
				'id' => 1002, 'field_one' => 's1.1.m2.f2', 'field_two' => 's1.1.m2.f2'
			))
		);
		$array2 = array(
			array('ModelOne' => array(
				'id' => 1001, 'field_one' => 's2.0.m1.f1', 'field_two' => 's2.0.m1.f2'
			)),
			array('ModelTwo' => array(
				'id' => 1002, 'field_one' => 's2.1.m2.f2', 'field_two' => 's2.1.m2.f2'
			))
		);

		$result = Set::append($array1, $array2);
		$this->assertIdentical($result, $array1);

		$array3 = array(array('ModelThree' => array(
			'id' => 1003, 'field_one' => 's3.0.m3.f1', 'field_two' => 's3.0.m3.f2'
		)));

		$result = Set::append($array1, $array3);
		$expected = array(
			array(
				'ModelOne' => array(
					'id' => 1001, 'field_one' => 's1.0.m1.f1', 'field_two' => 's1.0.m1.f2'
				),
				'ModelThree' => array(
					'id' => 1003, 'field_one' => 's3.0.m3.f1', 'field_two' => 's3.0.m3.f2'
				)
			),
			array('ModelTwo' => array(
				'id' => 1002, 'field_one' => 's1.1.m2.f2', 'field_two' => 's1.1.m2.f2'
			))
		);
		$this->assertIdentical($expected, $result);

		$result = Set::append($array1, array());
		$this->assertIdentical($result, $array1);

		$result = Set::append($array1, $array2);
		$this->assertIdentical($result, $array1 + $array2);

		$result = Set::append(array(), array('2'));
		$this->assertIdentical(array('2'), $result);
	}