PHP performs nearby location query based on a given longitude and latitude point-PHP Tutorial-php.cn

The implementation principle is to first calculate the four points of the rectangle around the point, and then use the longitude and latitude to directly match the records in the database.

//Get surrounding coordinates
public function returnSquarePoint($lng, $lat,$distance = 0.5){
$earthRadius = 6378138;
$dlng = 2 * asin(sin($distance / (2 * $earthRadius )) / cos(deg2rad($lat)));
$dlng = rad2deg($dlng);
$dlat = $distance/$earthRadius;
$dlat = rad2deg($dlat);
return array(
'left -top'=>array('lat'=>$lat + $dlat,'lng'=>$lng-$dlng),
'right-top'=>array('lat'=> $lat + $dlat, 'lng'=>$lng + $dlng),
'left-bottom'=>array('lat'=>$lat - $dlat, 'lng'=>$lng - $dlng),
'right-bottom'=>array('lat'=>$lat - $dlat, 'lng'=>$lng + $dlng)
);
}
//Calculate two The straight-line distance of coordinates
public function getDistance($lat1, $lng1, $lat2, $lng2){
$earthRadius = 6378138; // Approximate earth radius in meters
// Convert to radians
$lat1 = ($lat1 * pi()) / 180;
$lng1 = ($lng1 * pi()) / 180;
$lat2 = ($lat2 * pi()) / 180;
$lng2 = ($lng2 * pi()) / 180;
// Use the semisine formula to calculate with a ruler and compass
$calcLongitude = $lng2 - $lng1;
$calcLatitude = $lat2 - $lat1;
$stepOne = pow(sin($calcLatitude / 2), 2 ) + cos($lat1) * cos($lat2) * pow(sin($calcLongitude / 2), 2);
$stepTwo = 2 * asin(min(1, sqrt($stepOne)));
$calculatedDistance = $earthRadius * $stepTwo;
return round($calculatedDistance);
}

Copy code

PHP

Php8, I'm coming too

Learn website layout in 30 minutes

Shangguan Oracle Beginner to Proficient Video Tutorial

Your first line of UNI-APP code

Flutter from scratch to app launch

Brother Lian New Linux Video Tutorial

AXURE 9 Video Tutorial (Suitable for Product Manager Interactive Product Design UI)

Zero Basic Proficiency PS Video Tutorial

16 day UI video tutorial to get you started

PS Techniques and Slicing Techniques Video Tutorial

Alibaba Cloud Environment Construction and Project Launch Video Tutorial

Overview of Computer Networks - Basic Knowledge that Programmers Must Master

Essential Tutorial for Programmers - HTTP Protocol Explanation

Websocket Video Tutorial

PHP performs nearby location query based on a given longitude and latitude point