PHP code to merge element values ​​of multiple arrays without duplication

/**
* Merge element values ​​of multiple arrays without duplication
* by bbs.it-home.org
*/
function array_values_merge()
{
    $argc = func_num_args();
    if ($argc == 0) {
        return false;
    } else if ($argc == 1) {
        $arg1 = func_get_arg(0);
        if (is_array($arg1)) {
            return array_values(array_unique($arg1));
        } else {
            return array($arg1);
        }
    } else {
        $arg_list = func_get_args();
        $arr = array();
        for ($i=0; $i<$argc; $i++) {
            $arr = array_merge($arr, $arg_list[$i]);
        }
        return array_values(array_unique($arr));
    }
}

//调用示例
$a = array('huanghao');
$b = array('huanghao','zhaodefang','jiangyu');
$c = array('zhaodefang','hh');
print_r(array_values_merge($a, $b, $c));