Highchart and json with codeigniter

See the following discussion thread. Hopefully it helps.
http://stackoverflow.com/questions/29233...odeigniter

I have solved it using the code:

$ctg=$category['month'];

$this->view_data['month'] = json_encode($ctg, JSON_NUMERIC_CHECK);

Then in chart_high view, I used

xAxis: {
               categories: <?php echo $month ; ?>
           },

Now the months are displayed in x-axis as January, February, March..etc. I have searched in many forums including stackoverflow but didnt find any solution.
I am posting as it may help someone in future.