Note: I am sick of people mark it down without any comment! if you think this was a bad question please let me know why! This was not a school test, I am here to learn.
Update: I have a string of array= array ("postcode1","postcode2","postcode3"); generates all markers on my google map and a single read button on each of the marker infowindow, how do I display the according information base on which marker I pressed?
All I can get now is the data of all postcodes, I know the reason is because of there wasn't a relation between what I queried out and the postcode.
Thanks to @Manjeet Barnala again, all I need was to add an id for the button and use GET method to get the data.