Database to XML to quick-loading SVG Graph

This code is derived from some code I posted on Github in Feb 2014 making a SVG graph from a database. The code is updated and instead of counting all the rows every time the graph is loaded I added an extra stage to take the counting out of the equation. Now, the SVG is super quick-loading because it uses the final "counted" values from a very simple XML file. An alternative way to do this would have been to have the "counted" values in a database.

The dots you see are clickable and they have the mouseover effect of display the date and value for that month.

This PHP code is re-useable and is the engine for several similar graphs.

Added: 07 Aug 2015

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