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.


use content-type as javascript in header

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

and then use getjson method of jquery as

          chart_cfd.series = response;

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