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"}';

						}

				}

			}

			

	}





?>

浏览器解析为

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

怎么将前一行去掉！ JSON php PHP

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------解决方案--------------------
php页面里去掉这句不就行了
------解决方案--------------------
include "./mobile/sql.php"; 这个里的吧
------解决方案--------------------
估计是 include "./mobile/sql.php"; 文件生成的吧，贴出来看看。