Find whats in a radius of a postcode

Hi All,

Does anyone know a way to find what is in a radius of a postcode using PHP. A great example of what I want is on property websites where it says enter a location and how many miles from that location do you want to live 1, 2 or 3 miles. Then the PHP coding picks all the properties that are in the location I selected and then all the properties within the radius of 1, 2 or 3 miles of the location. I can get hold of all the postcodes with relating area names and longitude and latitude.

Thanks

Carl

Its hard to say how to do this specifically, but here is a high level. When they pick the initial location, you'll need to get the latitude and longitude. Then you need to see how much 1 mile corresponds to in latitude longitude. Using that measurement, you can get a range of acceptable latitude longitude values for your mile radius. Using this range, you would have to devise a database query that finds all results with a location falling inside your 1 mile range. I think something like that would do that trick.

There are lots of people that offer canned solutions for this as well:

zip-code-locators/