How to turn a file of addresses into latitude, longitude coordinates

Addressfile
Photo by TypeFiend

Some friends recently needed a hand converting a large set of addresses into map coordinates, so I pulled together some code I was using in other projects into a small script. It uses Yahoo's Geoplanet API since I've found that gives good results with a lot fewer restrictions than Google's geocoder. Since it seemed like this might be handy for other people too, I've put the code up on github at http://github.com/petewarden/geocodefile

To use it, get a free app ID from Yahoo and then run

./geocodefile.php -i testdata.txt -o output.txt -s

After a few seconds it should complete, and the output should contain estimated latitude,longitude coordinates for all the locations in the test data.

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