This is a good tutorial on the different types of web page caching. It will give you insight on the best way to cache your site. Caching Tutorial for Web Authors and Webmasters

You can do http requests using the Curl library and decode the JSON result with json_decode() function. PHP 5.2 and above comes with the JSON library functions. The following example will send a request to brightcove’s api using curl and extract some video thumbnail image links. The result will be a list of links in [...]