How to find nearest gps coordinates?

Question

PHP

I request the coordinates of points in the city:

foreach ($data as $Full) 
{echo $Full['GPS'];};

Will give, for example:

55.0461612.60.1068595
55.058817.60.107156
55.1352482.60.1488734
55.150504.60.151353
55.041317.60.111684
52.1352482.62.1484734
57.1505.61.151334
51334.6.61.5133.6.61A

And there are two variables that contain the exact address

echo $geo[lat];
echo $geo[lon];

Will give, for example:

55.0472483
and
60.096523

What is the best way to compare and make a condition to select, for example, 3 nearest points?

Answer 1

If the shortest geographically, then consider the distance along the arc of the great circle .
And if for a person, then there are a lot of factors. For example, the geographically closest point is 200 meters across the river, but the bridge is 10 kilometers away. Or to one point an hour on foot, and to a further 15 minutes by bus.