[Solved]-Use MySQL data as the chart data for the cakephp highchart plugin-Highcharts

after lots of checking i eventually found the problem. the cake plug in helper expects integer (or reals) in the chartdata1 array. so simple adding the following lines:

foreach ($resultstatistics as $result) {
    $chartdata[] = (int) $result['statistic']['new_students_total'];  
}

at last solved my problem. thank anyway for your help