php形成json语句，多出前面一句，如何去掉

php形成json语句，多出前面一句，怎么去掉！
php源码

	//session start

	session_start();

	include "./mobile/sql.php";

	$con = mysql_connect($domain,$usrnm,$password);

	mysql_select_db($usrnm) or die('Could not select database'); 

	mysql_query("set character set 'utf8'");

	$page = $_GET['page'];



	if(!$con){


		echo("can not connect");

	}

	else{

		//1.登陆授权

		if($page=='login'){

			//1.读取用户数据，并进行匹配

			$usrname = $_GET['usrnm'];

			$pas			= $_GET['pas'];


			//2.检索数据库

			$sql = "select * from mb_usr";

			$result = mysql_query($sql) or die('Query failed: ' . mysql_error());


			while( $row = mysql_fetch_array($result) ){


 			   	if(($row['usrid']==$usrname || $row['mail']==$usrname || $row['phoneno']==$usrname) && $row['pas']==$pas){

					//3.分配session值 保留登陆时限

					$_SESSION[$usrname] = $usrname;


					//4.构建login的json格式

					$jsonArr = Array('logintype'=>$row['usrtype'],'sessionid'=>$usrname,'usrnm'=>$row['usrnm'],'usrid'=>$row['usrid']);


					echo json_encode($jsonArr);


					break;

					}

					else{

						echo '{"logintype":"-1"}';

						}

				}

			}


	}



?>

nbsp;html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

{"logintype":"0","sessionid":"0","usrnm":"mjc","usrid":"0"}