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Convert Latitude & Longitude (Decimal) to Easting & Northing

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5.6
I need to convert Longitude and Latitude to Easting and Northing for locations in Australia, so our mapping engine can display them on a map. While the engine supports a single location using Latitude and Longitude, it requires eastings and northings if I want it to display more than one location at the same time.

I want to write a PHP script which can convert latitude to northing, and longitude to easting.

The script will be easy if I know the mathematical formula, I guess. Most of the places on the web that show the formula use complex looking squiggles and symbols, and I cant understand them, as i'm no mathemetician. Can anyone show me the equation to do this? I think it should be easy...
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