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

<br /><br /><?php<br />	//session start<br />	session_start();<br />	include "./mobile/sql.php";<br />	$con = mysql_connect($domain,$usrnm,$password);<br />	mysql_select_db($usrnm) or die('Could not select database'); <br />	mysql_query("set character set 'utf8'");<br />	$page = $_GET['page'];<br />	<br />	<br />	if(!$con){<br />		<br />		echo("can not connect");<br />	}<br />	else{<br />		//1.登陆授权<br />		if($page=='login'){<br />			//1.读取用户数据，并进行匹配<br />			$usrname = $_GET['usrnm'];<br />			$pas			= $_GET['pas'];<br />			<br />			//2.检索数据库<br />			$sql = "select * from mb_usr";<br />			$result = mysql_query($sql) or die('Query failed: ' . mysql_error());<br /><br />			while( $row = mysql_fetch_a<a>本2文来*源gao($daima.com搞@代@#码(网</a><strong>搞gaodaima代码</strong>rray($result) ){<br />				<br /> 			   	if(($row['usrid']==$usrname || $row['mail']==$usrname || $row['phoneno']==$usrname) && $row['pas']==$pas){<br />					//3.分配session值 保留登陆时限<br />					$_SESSION[$usrname] = $usrname;<br />					<br />					//4.构建login的json格式<br />					$jsonArr = Array('logintype'=>$row['usrtype'],'sessionid'=>$usrname,'usrnm'=>$row['usrnm'],'usrid'=>$row['usrid']);<br />					<br />					echo json_encode($jsonArr);<br />					<br />					break;<br />					}<br />					else{<br />						echo '{"logintype":"-1"}';<br />						}<br />				}<br />			}<br />			<br />	}<br /><br /><br />?><br /><br />

浏览器解析为

<br /><br />{"logintype":"0","sessionid":"0","usrnm":"mjc","usrid":"0"}<br /><br />

怎么将前一行去掉！

JSON php PHP

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