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( $row = mysql_fetch_array($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
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><br>
{"logintype":"0","sessionid":"0","usrnm":"mjc","usrid":"0"}<br>
<br>
怎么将前一行去掉！
JSON
php
PHP
