[OT] Finding country code from full MSISDN in PHP

Hi,

A bit [OT] but thought I'd ask. Has anyone got a PHP snippet that'll parse a full MSISDN and return the country code? I figured one way to do it would be run a loop of SQL selects on the first four,three,two,one digits of the MSISDN until a match was found - but there must be a better way?

Alex