[PHP] Function? How to find if xy values are within a coordinates of polygon?

[SED]

I'm making a map (image) which you can click on and the script finds the
area-code based on where you click on the map.

Before I spend time on writing my own code to find if xy values are
within a certain coordinates of a polygon, do you know of any build in
function to do it? I have browsed lightly through the PHP-manual but not
found any.

Thanks,

SED


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