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
<br><!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
