PHP can't check for and get json sent data from jquery: -


when try returns "error". code in 1 file called index.php php:

if($_post){     $return="success.";     echo json_encode($return); }

jquery:

function save(){                 $.ajax({                     url: "./index.php",                     type: "post",                     data: {                          example:"example",                         example2:$(".content").text()                     },                     datatype: "json"                 }).done(function(data){                     $('#response').append('<p style="color:red;">'+data+'</p>');                     alert("done");                 }).fail(function(){                     $('#response').append('<p style="color:red;">error</p>');                 });             }

this requested network tab , think ok post. network tab:

remote address:127.0.0.1:80 request url:http://localhost/test/test/test/index.php request method:post status code:200 ok request headersview source accept:application/json, text/javascript, */*; q=0.01 accept-encoding:gzip,deflate accept-language:en-us,en;q=0.8,bg;q=0.6 connection:keep-alive content-length:606 content-type:application/x-www-form-urlencoded; charset=utf-8 cookie:_ga=ga1.1.1569762264.1406894118 host:localhost origin:http://localhost referer:http://localhost/test/test/test/ user-agent:mozilla/5.0 (x11; linux x86_64) applewebkit/537.36 (khtml, gecko) chrome/37.0.2062.94 safari/537.36 x-requested-with:xmlhttprequest form dataview sourceview url encoded example:example example2: <?php     if(true){         echo 'ds';         //das     } .test {     size: 5pt; }  response headersview source connection:keep-alive content-length:1641 content-type:text/html date:tue, 09 sep 2014 20:03:46 gmt keep-alive:timeout=5, max=97 server:apache/2.4.9 (unix) openssl/1.0.1g mod_fcgid/2.3.9 php/5.5.11 mod_perl/2.0.8-dev perl/v5.16.3 x-powered-by:php/5.5.11

and here response tab in network tab:

"success."<!doctype html> <html>     <head>         <title>text</title>         <script src="style/jquery.min.js"></script>         <script>         $(document).ready(function() {              function save(){                 $.ajax({                     url: "./index.php",                     type: "post",                     data: {                          filename:"something.php",                         text:$(".content").text()                     },                     datatype: "json"                 }).done(function(data){                     $('#response').append('<p style="color:red;">'+data+'</p>');                     alert("done");                 }).fail(function(){                     $('#response').append('<p style="color:red;">error</p>');                 });             }              $(".content").focus(function(){                 $(window).bind('keydown', function(event) {                     if (event.ctrlkey || event.metakey) {                         switch (string.fromcharcode(event.which).tolowercase()) {                             case 's':                             event.preventdefault();                             save();                             break;                         }                     }                 });             });         });         </script>         <style>             .content {                 width: 80%;                 height: 80%;                 border: 1px solid #ccc;                 padding: 5px;             }         </style>     </head>     <body>         <div id="response"></div>         <pre><div class="content"> &lt;?php     if(true){         echo 'ds';         //das     } .test {     size: 5pt; }         </div></pre>     </body> </html>

can tell me how fix problem?

if client expecting json, can't print other json. should exit script after that:

if($_post){     $return="success.";     echo json_encode($return);     exit(); }  ?> <!doctype html> <html> ...

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