Professional WordPress Solutions

<?php
/**
 * The template for displaying 404 pages (not found)
 */

get_header();
?>

<div class="error-page-container">
    <h1>404</h1>
    <h2><?php echo __('Page Not Found', 'your-theme-domain'); ?></h2>
    
    <p><?php echo __('The page you are looking for might have been removed, had its name changed, or is temporarily unavailable.', 'your-theme-domain'); ?></p>
    
    <!-- Search form to help users find what they need -->
    <div class="search-form-container">
        <p><?php echo __('Please try searching:', 'your-theme-domain'); ?></p>
        <?php get_search_form(); ?>
    </div>
    
    <!-- Popular content suggestions -->
    <div class="popular-content">
        <h3><?php echo __('Popular Pages', 'your-theme-domain'); ?></h3>
        <ul>
            <?php
            // Display most popular posts based on view count
            $popular_posts = new WP_Query(array(
                'post_type' => 'post',
                'posts_per_page' => 5,
                'meta_key' => 'post_views_count',
                'orderby' => 'meta_value_num',
                'order' => 'DESC'
            ));
            
            while ($popular_posts->have_posts()) : $popular_posts->the_post(); ?>
                <li><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></li>
            <?php endwhile; 
            wp_reset_postdata();
            ?>
        </ul>
    </div>
    
    <a href="<?php echo home_url(); ?>" class="back-home-btn"><?php echo __('Back to Homepage', 'your-theme-domain'); ?></a>
</div>

<?php get_footer(); ?>

// Log 404 errors in WordPress admin
function log_404_errors() {
    if (is_404()) {
        global $wpdb;
        
        // Create custom table if it doesn't exist
        $table_name = $wpdb->prefix . '404_errors';
        if ($wpdb->get_var("SHOW TABLES LIKE '$table_name'") != $table_name) {
            $sql = "CREATE TABLE $table_name (
                id mediumint(9) NOT NULL AUTO_INCREMENT,
                time datetime DEFAULT '0000-00-00 00:00:00' NOT NULL,
                url text NOT NULL,
                referer text,
                ip varchar(100),
                user_agent text,
                PRIMARY KEY  (id)
            )";
            require_once(ABSPATH . 'wp-admin/includes/upgrade.php');
            dbDelta($sql);
        }
        
        // Insert error data
        $wpdb->insert(
            $table_name,
            array(
                'time' => current_time('mysql'),
                'url' => $_SERVER['REQUEST_URI'],
                'referer' => isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : '',
                'ip' => $_SERVER['REMOTE_ADDR'],
                'user_agent' => $_SERVER['HTTP_USER_AGENT']
            )
        );
    }
}
add_action('template_redirect', 'log_404_errors');

// Auto redirect common 404 errors
function redirect_common_404s() {
    if (is_404()) {
        global $wp;
        $current_url = $wp->request;
        
        // Dictionary of common misspellings/redirects
        $redirect_rules = array(
            'about-us' => 'about',
            'contact-us' => 'contact',
            'services' => 'service',
            'blogs' => 'blog',
            // Add more rules as needed
        );
        
        // Check for fuzzy matches
        foreach ($redirect_rules as $wrong => $right) {
            if (strpos($current_url, $wrong) !== false) {
                $new_url = str_replace($wrong, $right, $current_url);
                wp_redirect(home_url($new_url), 301);
                exit;
            }
        }
    }
}
add_action('template_redirect', 'redirect_common_404s');