在PHP中删除多维数组中特定键的重复值，但删除最后一个？

function deleteLastDuplicateValue(&$array, $key) {
    $found = false;
    foreach($array as &$value) {
        if(is_array($value)) {
            $found = deleteLastDuplicateValue($value, $key) || $found;
        } elseif ($value === $key) {
            if($found) {
                unset($value);
            } else {
                $found = true;
            }
        }
    }
    return $found;
}

$array = array(
    "key1" => array(
        "value1",
        "value2",
        "value3",
        "value3"
    ),
    "key2" => "value2",
    "key3" => array(
        "value1",
        "value1",
        "value2",
        "value3"
    )
);

deleteLastDuplicateValue($array, "value3");
print_r($array);

Array
(
    [key1] => Array
        (
            [0] => value1
            [1] => value2
            [3] => value3
        )

    [key2] => value2
    [key3] => Array
        (
            [0] => value1
            [1] => value1
            [2] => value2
            [3] => value3
        )
)