View difference between Paste ID: YAFJ2TWK and DGbEpYea

 <?php
 
 /*
-Plugin Name: Post Permalinks Redirect Fallback
+ * Plugin Name: Post Permalinks Redirect Fallback
-Plugin URI: http://maciejbis.net
+ * Plugin URI: http://maciejbis.net
-Description: A plugin that adjusts the functionality of this website
+ * Description: A plugin that adjusts the functionality of this website
-Version: 1.0
+ * Version: 1.0
-Author: Maciej Bis
+ * Author: Maciej Bis
-Author URI: http://www.maciejbis.net
+ * Author URI: http://www.maciejbis.net
-License: GPL2
+ * License: GPL2
 */
 
 function bis_redirect_posts_from_404() {
 	global $wp, $wpdb, $wp_query, $pm_query;
 
-	if(is_404() && !empty($wp->request) && is_user_logged_in()) {
+	if(is_404() && !empty($wp->request)) {
 
 		// 1. Extract date parts
 		preg_match('/(2[\d]+)\/([\d]{2})\//', $wp->request, $date_parts);
 
 		if(empty($date_parts)) {
 			return;
 		}
 
 		// 2. Extract the first & last two words
 		$slug = basename($wp->request);
 		$slug = esc_sql($slug);
 
 		preg_match('/^([^-]+-[^-]+)(?:.*-([^-]+-[^-]+)$)?/', $slug, $words);
 
 		if(!empty($words[2])) {
 			$where_statement = sprintf('(post_name = "%s" OR post_name LIKE "%%%s%%" OR post_name LIKE "%%%s%%")', $slug, $words[1], $words[2]);
-		} else if(!empty($words[2])) {
+		} else if(!empty($words[1])) {
 			$where_statement = sprintf('(post_name = "%s" OR post_name LIKE "%%%s%%")', $slug, $words[1]);
 		} else {
 			return;
 		}
 
 		// 3. Add the extracted date to the query
 		$year = (int) $date_parts[1];
 		$month = (int) $date_parts[2];
 		$where_statement .= sprintf('AND (YEAR(post_date) = %d AND MONTH(post_date) = %d)', $year, $month);
 
 		// 4. Limit the search results to posts with 'publish' status
 		$where_statement .= "AND post_status = 'publish' AND post_type = 'post'";
 
 		$post_id = $wpdb->get_var("
 			SELECT ID FROM {$wpdb->posts}
 			WHERE {$where_statement}
 		");
 
 		if(!empty($post_id)) {
 			$url = get_permalink($post_id);
 
 			if(!empty($url)) {
 				wp_safe_redirect($url, 301);
 				exit();
 			}
 		}
 	}
 }
 add_action('template_redirect', 'bis_redirect_posts_from_404', 1);