修复mysql所有的表

<?php
 class tools{
 	/**
 	 * 
 	 * @param string $usr 用户名
 	 * @param string $pwd 密码
 	 * @param string $dbname 数据库名称
 	 * @param string $charset 字符集
 	 */
 	function repair_mysql_tables($usr,$pwd,$dbname,$charset="utf8"){
 	
 		$dsn="mysql:host=127.0.0.1;port=3306;dbname=".$dbname;
 		try{
 			$conn=new PDO($dsn ,$usr,$pwd,array(PDO::ATTR_PERSISTENT=>true));
 			$conn->exec("SET NANMES".$charset);
 		}catch(PDOException $e){
 		
 			echo "Error!:".$e->getMessage()."<br/>";
 			die(&#39;db connect failed ...&#39;);
 		}
 		$arr=$conn->query("show tables");
 		$arr1=$arr->fetchAll(PDO::FETCH_ASSOC);
 		foreach ($arr1 as $a){
 			foreach ($a as $a1){
 				$conn->query("repair table  ".$a1);
 				echo "table ：<span style=&#39;color:red;&#39;>".$a1."</span> is repair..<br/>";
 			}
 		}
 		echo "task complete !";
 	}	
 }
 //调用方法
   $too=new tools();
   $too->repair_mysql_tables("root", "", "fangjia");
 ?>