Matt,
Use the links found on the Wamp Manager icon to edit php.ini, to make sure you are editing the correct one. Unfortunately there are more than one in the wamp env for other reasons we do no need to go into now.
Also use the wamp manager 'Start all services' , 'Stop all Services', 'Restart all Services' options just to make sure you are restarting the correct services. Its just easier a
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