Salesforce.com's PHP SDK is a toolkit that helps developers make Salesforce.com API method calls from PHP code. The SDK requires PHP 5, and users will need to have SOAP, SSL, cURL, and Open SSL enabled.
So far more than 650 APIs have been added to the ProgrammableWeb directory in 2014 and some new trends are starting to emerge. Some recent popular categories remain near the top of the charts. The financial APIs that put APIs in the mainstream continue to expand, adding about 50 new APIs in the first quarter. A few other categories were less consistent and had extreme rises or falls in popularity.