<?php        function AddUser($name)   {     if($name=="张三")     {       echo "add success";       return true;     }else     {        throw new Exception("添加失败");     }   }    function updateUser($username)   {    if($username=="张三")    {     return true;    }else{     throw new Exception("更新失败！");    }   }   function A(){         try{     $res1=AddUser("hell");     $res2=updateUser("world");    }catch(Exception $ex)    {      echo "处理失败！错误信息：".$ex->getMessage();        }      }    A();    ?>