Calculating the extent for a coordinate and zoom level in MapScrip

[Matthew Lock]

Hello,
How do I go about calculating an extent for a given coordinate and zoom
level in MapScript?

My application receives map coordinates as x and y (in my current
projection) and a zoom level in my current map units. How do I calculate an
extent that I can use to center my map on this coordinate at the required
zoom level?

Regards,
Matthew Lock
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