<? $zcusername=isset($_POST['zcusername'])?$_POST['zcusername']:''; $zcpassword=isset($_POST['zcpassword'])?$_POST['zcpassword']:''; $qrpassword=isset($_POST['qrpassword'])?$_POST['zcpassword']:'';    $def_zcusername='reg_zcusername'; $def_zcpassword='reg_zcpassword'; $def_qrpassword='reg_zcpassword';    if($zcusername !=$def_zcusername){     echo json_encode(array('result'=>'账号格式有误'))；这一行报的错     die();      }      if($zcpassword !=$def_zcpassword){     echo json_encode(array('result'=>'密码格式有误'))；和这一行     die();     }      if($qrpassword !=$def_zcpassword){     echo json_encode(array('result'=>'两次密码格式不同'))}；还有这一行     die();     }          echo json_encode(array('result'=>'注册成功'))                ?>