pb_refresh_news.php

<?php

/*
* Refreshes the Transient data.
*/
function pb_refresh_news() {
 
    // Make HTTP request to BBC News API.
    $response = wp_remote_request( 'http://api.bbcnews.appengine.co.uk/stories/headlines' );
 
    // Response is in JSON format, so decode it.
    $news = json_decode( $response['body'] );
 
    // Add custom expiry time
    // MINUTE_IN_SECONDS and the other similar constants are all included in WordPress.
    $news->expiry = time() + ( 5 * MINUTE_IN_SECONDS );
 
    // Set transient with latest News data
    set_transient( 'pb_bbc_news', $news, 24 * HOUR_IN_SECONDS );

    return $news;

}

?>