random-post-button-snippet.php

<?php
/**
 * Function: Redirect to a random post
 * URL: http://wpsites.org/?p=10370
 * by Leo
 */
add_action('init','random_add_rewrite');
function random_add_rewrite() {
       global $wp;
       $wp->add_query_var('random');
       add_rewrite_rule('random/?$', 'index.php?random=1', 'top');
}
 
add_action('template_redirect','random_template');
function random_template() {
       if (get_query_var('random') == 1) {
               $posts = get_posts('post_type=post&orderby=rand&numberposts=1');
               foreach($posts as $post) {
                       $link = get_permalink($post);
               }
               wp_redirect($link,307);
               exit;
       }
}
?>

random-post-page-template.php

<?php
/**
 * Template Name: Random Post
 *
 */
 ?>
<?php
 
$args = array(
    'posts_per_page' => 1,
    'orderby' => 'rand'
);
 
$my_random_post = new WP_Query ( $args );
 
if ($my_random_post->have_posts()) :
 
    while ($my_random_post->have_posts()) : $my_random_post->the_post(); ?>
 
    <?php
        wp_redirect ( get_permalink () );
        exit;
    ?>
 
    <?php endwhile;?>
<?php endif; ?>