Add 404 page with redirects for legacy URLs

404.php

@@ -0,0 +1,43 @@
+<?php get_header(); ?>
+
+<article id="entry">
+                <div class="row">
+                    <div class="span8">
+
+<?php
+
+// Redirect legacy urls, which have the structure of:
+// /blog/2009/01/title.html or
+// /news/2009/01/title.html or
+
+$uri = $_SERVER['REQUEST_URI'];
+
+$pos_blog = strpos($uri, 'blog/');
+$pos_news = strpos($uri, 'news/');
+
+if ($pos_blog || $pos_news) {
+    $filename = explode('/', $uri);
+    $filename = $filename[sizeof($filename) - 1];
+    $filename = substr($filename, 0, -5);
+    $filename = str_replace("_", " ", $filename);
+    $filename = ereg_replace("[^A-Za-z ]", "", $filename);
+    ?>
+    <script type="text/javascript">
+    window.location = '<?php echo(site_url()); ?>/?s=<?php echo(urlencode($filename)); ?>';
+    </script>
+    <br />
+    <p>You're being redirected to the page you requested. If you're not redirected within a few seconds, <a href="<?php echo(site_url()); ?>/?s=<?php echo(urlencode($filename)); ?>">click here</a> to continue.</p>
+    <?php
+} else {
+?>
+    <h2 class="entry-title">Not Found</h2>
+    <p>Sorry, we couldn't find the page you requested.</p>
+<?php
+}
+?>
+                    </div><!--/.span8-->
+                </div><!--/.row-->
+</article>
+
+
+<?php get_footer(); ?>

functions.php

@@ -0,0 +1,42 @@
+<?php
+// Redirect to post if search returns only one result
+function redirect_to_single_search_result() {
+  if( is_search() ){
+    global $wp_query;
+    if( $wp_query->post_count == 1 ){
+      wp_redirect( get_permalink($wp_query->posts['0']->ID), 302 );
+      exit;
+    }
+  }
+}
+add_action('template_redirect', 'redirect_to_single_search_result');
+
+// Restrict search to post titles
+function __search_by_title_only( $search, &$wp_query ) {
+    global $wpdb;
+
+    if ( empty( $search ) )
+        return $search; // skip processing - no search term in query
+
+    $q = $wp_query->query_vars;    
+    $n = ! empty( $q['exact'] ) ? '' : '%';
+
+    $search =
+    $searchand = '';
+
+    foreach ( (array) $q['search_terms'] as $term ) {
+        $term = esc_sql( like_escape( $term ) );
+        $search .= "{$searchand}($wpdb->posts.post_title LIKE '{$n}{$term}{$n}')";
+        $searchand = ' AND ';
+    }
+
+    if ( ! empty( $search ) ) {
+        $search = " AND ({$search}) ";
+        if ( ! is_user_logged_in() )
+            $search .= " AND ($wpdb->posts.post_password = '') ";
+    }
+
+    return $search;
+}
+add_filter( 'posts_search', '__search_by_title_only', 500, 2 );
+?>