Servces_Twitterを拡張して定義ファイルを追加で読み込めるようにする。

example.php

<?php

$foo = new MY_Services_twitter();
$foo->addAPI( "/the/path/to/your/api.xml" );

MY_Services_twitter.php

<?php

require_once( "Services/Twitter.php" );

class MY_Services_twitter extends Services_twitter {
	
	public function __construct(){
		parent::__construct();
	}

	public function addAPI( $xml ){
		if( !file_exists( $xml ) ){
			throw new Exception( "'{$xml}' is not found." );
		}
		$xmlApi = simplexml_load_file( $xml );
		foreach ($xmlApi->category as $category) {
			$catName = (string)$category['name'];
			if( !is_array( $this->api[$catName] ) ){
				$this->api[$catName] = array();
			}
			foreach ($category->endpoint as $endpoint) {
				$this->api[$catName][(string)$endpoint['name']] = $endpoint;
			}
		}
	}
	
}