php 过滤掉多维数组空值

//过滤掉空值
function filter_array($arr, $values = ['',[]]){
    foreach ($arr as $k => $v) {
        if (is_array($v) && count($v)>0) {
            $arr[$k] = filter_array($v, $values);
        }
        foreach ($values as $value) {
            if ($v === $value) {
                unset($arr[$k]);
                break;
            }
        }
    }
    return $arr;
}

//过滤掉空值
function filter_array($arr){
    $narr = array();
    while(list($key, $val) = each($arr)){
        if (is_array($val)){
            $val = filter_array($val);
            if (count($val)!=0){
                $narr[$key] = $val;
            }
        }else{
            if (trim($val) != ""){
                $narr[$key] = $val;
            }
        }
    }
    unset($arr);
    return $narr;
}