PHP query near the people and their distance implementation method, PHP query distance implementation _php Tutorial

PHP query near the people and their distance implementation method, PHP query distance implementation

The example in this paper describes how to implement the people and their distances near PHP queries. Share to everyone for your reference, as follows:

<?php//gets the 4 points around the point $distance = 1;//Range (in units of kilometers) $lat = 113.873643; $lng = 22.573969;define (' Earth_radius ', 6371);//Earth radius, The average radius is 6371KM$DLNG = 2 * ASIN (SIN ($distance/(2 * earth_radius))/cos (Deg2rad ($lat))), $dlng = Rad2deg ($DLNG); $dlat = $dist Ance/earth_radius; $dlat = Rad2deg ($dlat); $squares = 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));p rint_r ($squares [' left-top '] [' lat ']);//query matching records from the digital library $info_sql = "SELECT * from ' A ' where lat<>0 and lat& Gt {$squares [' right-bottom '] [' lat ']} and lat<{$squares [' left-top '] [' lat ']} and lng>{$squares [' left-top '] [' LNG '] } and lng<{$squares [' Right-bottom '] [' LNG ']} ";//get distance between two points function getdistancebetweenpointsnew ($latitude 1, $ Longitude1, $latitude 2, $longitude 2) {$theta = $longitude1-$longitude 2; $miles = (sin (Deg2rad ($latitude 1)) * Sin (Deg2rad ($latitude 2)) + (cos (Deg2rad ($latitude 1)) * cos (Deg2rad ($latitude 2)) *  Cos (Deg2rad ($theta)));  $miles = ACOs ($miles);  $miles = Rad2deg ($miles);  $miles = $miles * 60 * 1.1515;  $feet = $miles * 5280;  $yards = $feet/3;  $kilometers = $miles * 1.609344;  $meters = $kilometers * 1000; Return compact (' Miles ', ' feet ', ' yards ', ' kilometers ', ' meters '); } $point 1 = array (' lat ' = = 40.770623, ' long ' = -73.964367); $point 2 = Array (' lat ' = = 40.758224, ' long ' = 73.9 17404); $distance = getdistancebetweenpointsnew ($point 1[' lat '), $point 1[' long ', $point 2[' lat '], $point 2[' long ']); foreach ($distance as $unit = + $value) {echo $unit. ': '. Number_format ($value, 4). '
';}? >

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