javascript - PHP Cookie Not Setting via AJAX -

i'm trying set php cookie via ajax. i'm putting 1 variable ("listingid") cookie name. if hard code name (eg. "cmappin220") cookie sets correctly, require variable in name identify it.

ajax:

function myfunc(listingid){      $.ajax({          url: 'cookie.php',         type: 'post',         data: {listingid:listingid},         datatype: 'html'      }).success(function(data){          $('.div66').html(data);      }).fail(function(jqxhr, errmsg) {          alert("request failed: " + errmsg);     });  } 

in "cookie.php"

this doesn't work:

<?php $cookiename = 'cmappin' . $_post['listingid']; setcookie($cookiename, '1', time()+30); ?> 

this works:

<?php $cookiename =   'cmappin220'; setcookie($cookiename, '1', time()+30); ?> 

your problem in post data

data: {listingid:listingid} 

you're not quoting name of parameter it's pulling value both name , value. try instead

data: {"listingid":listingid}