This is an example proxy script for working with the Yelp Fusion API from a browser. It is meant for instructional purposes only, and should not be used in a production environment with additional security measures.
First, copy config-sample.php to config.php, and update the parameters with your own app keys.
Then to call an API, pass a parameter _ep that contains the desired endpoint within the API, beginning with a forward slash:
jQuery.getJSON("./yelp.php?_ep=/businesses/search&term=Taco+Mac");
Note that the endpoint will be prepended with https://api.yelp.com/v3 (no trailing slash).
Any other parameters will be sent to the requested endpoint, so this should allow full access to the API. It is currently only meant for making GET requests; any POST/PUT/DELETE requests will fail in unexpected (but spectacular?!) ways.
Cheers!