lytePartners.php

<?php
/*
Classlessly add a "more tools" tab to promote (future) AO addons and/ or affiliate services
*/

if ( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly

add_action( 'admin_init', 'lyte_partner_tabs_preinit' );
function lyte_partner_tabs_preinit() {
    if ( apply_filters( 'wp-youtube-lyte_filter_show_partner_tabs', true ) ) {
        add_filter( 'wp-youtube-lyte_filter_settingsscreen_tabs', 'lyte_add_partner_tabs' );
    }
}

function lyte_add_partner_tabs( $in ) {
    $in = array_merge( $in, array( 'lyte_partners' => __( 'More Performance!', 'wp-youtube-lyte' ) ) );
    return $in;
}

add_action( 'admin_menu', 'lyte_partners_init' );
function lyte_partners_init() {
    if ( apply_filters( 'wp-youtube-lyte_filter_show_partner_tabs', true ) ) {
        $hook = add_submenu_page( '', 'Lyte partner', 'Lyte partner', 'manage_options', 'lyte_partners', 'lyte_partners' );
        // register_settings here as well if needed
    }
}

function lyte_partners() {
    ?>
    <style>
    .itemDetail {
        background: #fff;
        width: 250px;
        min-height: 290px;
        border: 1px solid #ccc;
        float: left;
        padding: 15px;
        position: relative;
        margin: 0 10px 10px 0;
    }
    .itemTitle {
        margin-top:0px;
        margin-bottom:10px;
    }
    .itemImage {
        text-align: center;        
    }
    .itemImage img {
        max-width: 95%;
        max-height: 150px;
    }
    .itemDescription {
        margin-bottom:30px;
    }
    .itemButtonRow {
        position: absolute;
        bottom: 10px;
        right: 10px;
        width:100%;
    }
    .itemButton {
        float:right;
    }
    .itemButton a {
        text-decoration: none;
        color: #555;
    }
    .itemButton a:hover {
        text-decoration: none;
        color: #23282d;
    }    
    </style>
    <div class="wrap">
        <h1><?php _e( 'WP YouTube Lyte Settings', 'wp-youtube-lyte' ); ?></h1>
        <?php echo lyte_admin_tabs(); ?>
        <?php
            echo '<h2>'. __( 'These related services will improve your site\'s performance even more!', 'wp-youtube-lyte' ) . '</h2>';
        ?>
        <div>
            <?php getLytePartnerFeed(); ?>
        </div>
    </div>
    <?php
}

function getLytePartnerFeed() {
    $noFeedText = esc_html__( 'Have a look at <a href="http://optimizingmatters.com/">optimizingmatters.com</a> for wp-youtube-lyte power-ups!', 'wp-youtube-lyte' );

    if ( apply_filters( 'wp-youtube-lyte_settingsscreen_remotehttp', true ) ) {
        $rss      = fetch_feed( 'https://feeds.feedburner.com/OptimizingMattersDownloads' );
        $maxitems = 0;

        if ( ! is_wp_error( $rss ) ) {
            $maxitems  = $rss->get_item_quantity( 20 ); 
            $rss_items = $rss->get_items( 0, $maxitems );
        } ?>
        <ul>
            <?php
            if ( $maxitems == 0 ) {
                echo $noFeedText;
            } else {
                foreach ( $rss_items as $item ) : 
                    $itemURL = esc_url( $item->get_permalink() ); ?>
                    <li class="itemDetail">
                        <h3 class="itemTitle"><a href="<?php echo esc_url( $itemURL ); ?>" target="_blank"><?php echo esc_html( $item->get_title() ); ?></a></h3>
                        <?php
                        if ( ( $enclosure = $item->get_enclosure() ) && ( strpos( $enclosure->get_type(), 'image') !== false ) ) {
                            $itemImgURL = esc_url( $enclosure->get_link() );
                            echo '<div class="itemImage"><a href="' . esc_url( $itemURL ) . '" target="_blank"><img src="' . esc_url( $itemImgURL ) . '"/></a></div>';
                        }
                        ?>
                        <div class="itemDescription"><?php echo wp_kses_post($item -> get_description() ); ?></div>
                        <div class="itemButtonRow"><div class="itemButton button-secondary"><a href="<?php echo esc_url( $itemURL ); ?>" target="_blank">More info</a></div></div>
                    </li>
                <?php endforeach; ?>
            <?php } ?>
        </ul>
        <?php
    } else {
        echo $noFeedText;
    }
}