How to calculate distance from lat/long in php?

Question

What I am trying to do is I have entries in the database which have a lat/long stored with them. I want to calculate the distance between users lat/long and entries lat/long

Answer 1

This query was perfect for me:

$latitude = "23.139422";  //your current lat
$longitude = "-82.382617"; //your current long

SELECT ( 3959 * acos( cos( radians( '.$latitude.' ) ) * cos( radians( latitude ) ) * 
 cos( radians( longitude ) - radians( '.$longitude.' ) ) + sin( radians( '.$latitude.' )
 ) * sin( radians( latitude ) ) ) ) AS distance from TABLE 
 HAVING distance <= 100 ORDER BY distance ASC