评价一上，小弟我写的oop

<?php<br />class db{<br />	public $conn;<br />	function __construct(){<br />		$this->conn=mysqli_connect('localhost','root','123123','air');<br />		//$this->conn->query('SET NAMES UTF8');<br />		mysqli_query($this->conn,'SET NAMES UTF8');<br />	}<br />	public function delete($table,$condition=""){<br />        if(empty($condition)) {<br />            $this->halt('没有设置删除的条件');<br />            return false;<br />        }<br />        $sql = "delete from ".$table." where 1=1 and ".$condition;<br />        if(!$this->conn->query($sql)){<br />        	return false;<br />        }else{<br />       		return true;<br />       	}//if<br />    }<br />      public function getAll($sql){//输出数组所有<br />        $rt=array();<br />		$q=$this->conn->query($sql);<br />		$this->conn->query('SET NAMES UTF8');<br />		while($r=$q->fetch_array(MYSQLI_USE_RESULT)){<br />			$rt[]=$r;<br />		}<br />		return $rt;    	<br />    }  <br />	public function __destruct(){<br />		mysqli_close($this->conn);<br />    }<br />}//db<br />?>