Area of Latitude/Longitude Rectangle using PHP

I went searching for how to calculate the area of a rectangle* on the surface of the earth using PHP and didn’t find one online. ¬†Someone probably has one somewhere, but it was just as fast for me to adapt one as it was to continue searching, so here it is. ¬†Enjoy.

This code is also available on GitHub if you prefer:
https://github.com/prairiewest/PHPRectangleArea

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