PHP calculates the maximum minimum latitude and longitude of 4 corners in the current coordinates 3 km, current latitude and longitude _php tutorial

PHP calculates the maximum minimum latitude and longitude of 4 corners in the current coordinates of 3 km, the current latitude and longitude degree

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));

More readers interested in PHP related content can view the topic: "PHP Date and Time usage summary", "PHP Object-oriented Programming tutorial", "PHP string (String) Usage Summary", "Php+mysql database operation Getting Started tutorial" and " A summary of common PHP database operation techniques

I hope this article is helpful to you in PHP programming.

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