Looking for a PHP version of the three-point positioning algorithm

I wrote it for a long time and debugged it, but all kinds of inaccuracies came up

The scumbag is already on his knees. .

Please post a three-point longitude and latitude positioning algorithm. Thank you

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I wrote it for a long time and debugged it, but all kinds of inaccuracies came up

The scumbag is already on his knees. .

Please post a three-point longitude and latitude positioning algorithm. Thank you