score:1

May be you should use application/json in your php file or you can use text/plain and then you can use $.parseJSON

function requestCFDStatusData(){
    $.post('ajax/cfdUtil/cfd_status.php', function(response){
        chart_cfd.series = $.parseJSON(response);
    });
}

This may help you.

score:2

use content-type as javascript in header

   header("Content-type: text/javascript");

and then use getJSON method of jquery as

      $.getJSON('ajax/cfdUtil/cfd_status.php',function(response){
          chart_cfd.series = response;
                   });

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