While Google’s documents for maps API does good job in showing how to get lat/long from an address in JavaScript they do not really show any example of doing the same with PHP.
So to make you life simple here is a small script in PHP that does that.
$geocode=file_get_contents('http://maps.google.com/maps/api/geocode/json?address=573/1,+Jangli+Maharaj+Road,+Deccan+Gymkhana,+Pune,+Maharashtra,+India&sensor=false');
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The line above makes a request to Google maps API. Passes the address, and receives the response in JSON format.
The URL has following options
http://maps.google.com/maps/api/geocode/output?parameters
where output can be 1) JSON or 2) XML
For more details about parameters check out the Google’s geocoding documentation.