This library is built for CodeIgniter 3+ (it should also work with version 2+, but is untested).
Save the Contentful.php file to your applications/libraries folder and add your space ID and tokens within the construct() - you can split this out in to a separate config file if you prefer.
Your contentful entries must have a field named urlHandle. This is what is used to return the correct entry.
All methods are called using the usual CodeIgniter syntax, for example:
// $params is an array of parameters to pass as url queries to help filter content (See Contentful API docs for available parameters).
$this->contentful->get('entries', $params=array());
This library is available under the MIT license.