Jake Spurlock

I want to have a check like this one:

<a href="<?php if ( function_exists('get_custom_field_value') ){
                            get_custom_field_value('todays_mix_URL', true);
                        } ?>">Download Now</a>

In this function:

<?php
                    include_once(ABSPATH . WPINC . '/feed.php');
                    $rss = fetch_feed(get_post_meta(get_the_ID(), "Blog RSS Feed", true));
                    $rss_items = $rss->get_items( 0, $rss->get_item_quantity(5) );
                    if ( !$rss_items ) {
                        echo 'no items';
                    } else {
                        foreach ( $rss_items as $item ) {
                            echo '<p><a href="' . $item->get_permalink() . '">' . $item->get_title() . '</a></p>';
                        }
                    }
                    ?>