PHP calculates the maximum minimum latitude and longitude instance in 4 corners in the current coordinates 3 km

This example describes the PHP method for calculating the maximum minimum latitude and longitude of 4 corners in the current coordinates of 3 km. Share to everyone for your reference, as follows:

$LNG, $lat latitude and longitude    $half = 6371;    $distance = 3; 3 km     $DLNG = 2 * ASIN (SIN ($distance/(2 * $half))/cos (Deg2rad ($lat)));    $DLNG = Rad2deg ($DLNG);    $dlat = $distance/$half;    $dlat = Rad2deg ($dlat);    $fourpoint = Array ('      left-top ' = = Array (' lat ' = = $lat + $dlat, ' lng ' = = $lng-$dlng),      ' right-top ' = The array (' lat ' = = $lat + $dlat, ' lng ' = + $lng + $dlng),      ' left-bottom ' = = Array (' lat ' = + $lat-$dlat, ' LNG ' = > $LNG-$dlng),      ' right-bottom ' = = Array (' lat ' = = $lat-$dlat, ' lng ' = + $lng + $dlng));

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