Support

<?php

function home_slider() {

    $slides = get_posts('post_type=slide&posts_per_page=-1');

    if(empty($slides)) return;

    $output .= '<ul class="bxslider">' . PHP_EOL;

    foreach($slides as $slide) {

        $meta = get_post_meta( $slide->ID, 'link', true );

        $output .= '<li><a href="' . $meta . '"><img src="' . wp_get_attachment_url(get_post_thumbnail_id($slide->ID)) . '"></a></li>' . PHP_EOL;

    }

    $output .= '</ul>';

    echo $output;

}