json - jquery form callback receiving null -

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i have jquery form: 

var uploadformoptions = {  target:        '#ur',  beforesubmit:  uploadvalidate,  // pre-submit callback  success:       uploadresponse,  // post-submit callback  datatype:      'json', error: function (xhr, ajaxoptions, thrownerror) {     alert(xhr.status);     alert(thrownerror);   }, resetform: true        // reset form after successful submit  };  $('#upload').ajaxform(uploadformoptions);

the response function declared:

function uploadresponse(responsetext, statustext, xhr, $form)  {

and ends responsetext === null. error function not called.

the script being called php , returns value. i'm @ loss. can help?

thanks.

the output in script is

if ( is_numeric( $uid["uid"] ) )       $bool = setcookie("gp_uid",                          $uid["uid"],                          time()+3600*24*365*10 /*expire: 10 years*/,                         '/'/*cookie-path*/);     print json_encode($uid);

you might need set response content type json below:

header('content-type: application/json');

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