php - Prevent echo JSON from going directly to screen -

i able pass json via ajax call , put contents in , same "echo" statement returning json "echos" json directly page, don't want. how prevent happening? here code:

my form:

<script type="text/javascript" src="includes_js/registration3.js"></script> 

ajax:

$.ajax({     type: "post",     url: "includes_php/registration3.php",     data: datastring,     datatype: "json",     success: function(data) {     $('.message').text(data);         }     }) 

php in url:

$msgarr[] = "please enter fields"; $json_msg=json_encode($msgarr); echo $json_msg; //also sends directly page     

success: function(data) { $('.message').text(data);//here magic happens,  //change line want } 

you have parse json: link

obj=$.parsejson(data) 

and can have access keys

alert(obj.key1); 

in php:

$msgarr = array("key1"=>"please enter fields"); $json_msg=json_encode(utf8_encode($msgarr)); //utf8 enconde avoid invalid format json  characters strangers  echo $json_msg;