Highchart xAxis label format issue while using PHP script

Can anyone suggest the right way of writing php code for formatting above array in xAxis? I get error while trying to create a Highchart in server side, using php script. Anyone using PHP script to create Highchart options?

If I use javascript code, it works fine. But I need it in server side and trying to print in a pdf. So JS is not suitable for me.

My array looks like below:

Array
    (
        [0] => Array
            (
                [x] => 1442851200
                [y] => 645.73
                [text] => A-17-5,CHANGKAT DUTA KIARA, KIARA 
                          VILLE, 504802,400 sq. ft.
            )
    )

My formatting code is given below:

'xAxis' => array(
      'type' => 'datetime',
      'dateTimeLabelFormats' => array(
          'month' => '%b \'%y',
          'year' => '%Y'
        ),
    )

I am getting (xAxis) below result with my formatting code:

I expect xAxis like below: