Custom APIs are essential for adding web application specific behaviors, which goes beyond the generic blogging functionality. We need the implementation for both the server and client to create a custom API. Here, we are going to build an API function that outputs the list of developers in a portfolio application. As usual, we are going to get started by creating another plugin folder named wpwa-xml-rpc-api with the main file named class-wpwa-xml-rpc-api.php.
Let's look at the initial code to build the API server:
class WPWA_XML_RPC_API {
public function __construct() {
add_filter('xmlrpc_methods', array($this, 'xml_rpc_api'));
}
public function xml_rpc_api($methods) {
$methods['wpwa.getDevelopers'] = array($this, 'developers_list');
return $methods;
}
}
new WPWA_XML_RPC_API();First, we use the plugin constructor to add the WordPress filter named xmlrpc_methods, which allows us to customize the API functions assigned to WordPress. The preceding filter...