Custom Leaderboard

// Register shortcode
add_action( 'init', 'register_my_shortcode' );
function register_my_shortcode() {
    add_shortcode( 'mycred_my_leaderboard', 'mycred_render_my_leaderboard' );
}

// Shortcode render only if myCRED is installed
if ( function_exists( 'mycred_label' ) ) :
    function mycred_render_my_leaderboard( $atts, $content = NULL ) {
        $attr = shortcode_atts( array(
            'number'   => '-1',
            'nothing'  => __( 'Leaderboard is empty.', 'mycred' )
        ), $atts );

        // What user details to return besides the ID
        $attr['user_fields'] = 'display_name,user_email';

        // Query the DB
        $rankings = new myCRED_Query_Rankings( $attr );
        $rankings->get_rankings();

        ob_start(); ?>

<table>
<?php
        // Have results
        if ( $rankings->have_results() ) {

            // Loop though each row
            foreach ( $rankings->result as $position => $user ) {
                // Result starts with zero
                $ranking = $position+1;

                // Total
                $qty = get_user_meta( $user['ID'], 'qty', false );
                $total = array_sum( $qty );

                // Product Names
                $products = get_user_meta( $user['ID'], 'product_name', false );
                $products = implode( '<br />', $products );

                // Product IDs
                $product_ids = get_user_meta( $user['ID'], 'product_id', false );

                // Product Images
                $images = array();
                if ( ! empty( $product_ids ) ) {
                    foreach ( $product_ids as $pid ) {
                        $image = wp_get_attachment_image_src( get_post_thumbnail_id( $pid ), 'single-post-thumbnail' );
                        if ( $image !== false )
                            $images[] = '<a href="' . get_permalink( $pid ) . '"><img src="' . $image[0] . '" width="100px" height="100px" /></a>';
                    }
                } ?>

    <tr class="">
        <td class="col-rank"><?php echo $ranking; ?></td>
        <td class="col-pic">
            <div class="whitebox pic-wrapper"><?php echo get_avatar( $user['user_email'], 96, home_url( '/wp-content/themes/Boke81/images/avatar.png' ) ); ?></div>
        </td>
        <td class="col-user">
            <a data-role="hovercard" data-direction="right" data-user-id="<?php echo $user['ID']; ?>" class="name"><?php echo $user['display_name']; ?></a>
        </td>
        <td class="col-owns"><?php echo $total; ?></td>
        <td class="col-img"><?php echo implode( '', $images ); ?></td>
        <td class="col-points"><?php echo mycred_format_creds( $user['cred'] ); ?></td>
    </tr>
<?php
            }

        }
        // Else
        else { ?>

    <tr>
        <td colspan="6">No users found</td>
    </tr>
<?php
        } ?>

</table>
<?php
        $output = ob_get_contents();
        ob_end_clean();

        return $output;
    }
endif;