I am using the Flot jQuery plugin to create a graph on how many visitors there have been per platform. I would like to create a 4th line with total visitors, calculated by previously retrieved data.
I need to combine several multi-dimensional Indexed arrays, but not simply merging them recursively. I.E:
$arr1 = [[2016/05/04,2],[2016/05/03,4],[2016/05/02,6]];
$arr2 = [[2016/05/04,1],[2016/05/03,3],[2016/05/02,2]];
$arr3 = [[2016/05/04,6],[2016/05/03,7],[2016/05/02,8]];
The output should be:
$arrTotal = [[2016/05/04,9],[2016/05/03,14],[2016/05/02,16]];
How do I accomplish this in a (fairly) simple way?