PHP表單提交數據 - 自動驗證合法性

/** 
燕十八 公益PHP培訓 
課堂地址:YY頻道88354001 
學習社區:www.zixue.it 
**/        

/*
格式 $this->_valid = array(
                    array('驗證的字段名',0/1/2(驗證場景),'報錯提示','require/in(某幾種情況)/between(範圍)/length(某個範圍)','參數')
        );

        array('goods_name',1,'必須有商品名','requird'),
        array('cat_id',1,'欄目id必須是整型值','number'),
        array('is_new',0,'in_new只能是0或1','in','0,1')
        array('goods_breif',2,'商品簡介就在10到100字符','length','10,100')

    */
    public function _validate($data) {
        if(empty($this->_valid)) {
            return true;
        }

        $this->error = array();

        foreach($this->_valid as $k=>$v) {
            switch($v[1]) {
                case 1:
                    if(!isset($data[$v[0]])) {
                        $this->error[] = $v[2];
                        return false;
                    }
                    
                    if(!$this->check($data[$v[0]],$v[3])) {
                        $this->error[] = $v[2];
                        return false;
                    }
                    break;
                case 0:
                    if(isset($data[$v[0]])) {
                        if(!$this->check($data[$v[0]],$v[3],$v[4])) {
                            $this->error[] = $v[2];
                            return false;
                        }
                    }
                    break;
                case 2:
                    if(isset($data[$v[0]]) && !empty($data[$v[0]])) {
                        if(!$this->check($data[$v[0]],$v[3],$v[4])) {
                            $this->error[] = $v[2];
                            return false;
                        }
                    }
            }
        }
        return true;
    }

    public function getErr(){
        return $this->error;
    }

    protected function check($value,$rule='',$parm='') {
        switch($rule) {
            case 'require':
                return !empty($value);

            case 'number':
                return is_numeric($value);

            case 'in':
                $tmp = explode(',',$parm);
                return in_array($value,$tmp);
            case 'between':
                list($min,$max) = explode(',',$parm);
                return $value >= $min && $value <= $max;
            case 'length':
                list($min,$max) = explode(',',$parm);
                return strlen($value) >= $min && strlen($value) <= $max;

            default:
                return false;
        }
    }