Question

I have a master zip code table tbl_zipcode with all latitude and longitude values. Also a restaurant table with restaurant list with zip codes.

Now I want to show the restaurants within 100 miles from user location i.e. from session user. How can I write a function which returns all the restaurants within 100 miles?

Any help is appreciated!!

Thanks.

Answer 1

So basically you have the longitude and latitude of the user and of all the restaurants..

check haversine formula
this is helpful: http://www.movable-type.co.uk/scripts/latlong.html

To implement the formula is pretty simple