michaeltyson

Leon Stafford

Save your visitors from unhelpful 404 errors!
Instead of quickly giving up when a visitor reaches content that doesn’t exist, make an effort to guess what they were 
after in the first place. This plugin will perform a search of your posts, pages, tags and categories, using keywords from the requested 
URL. If there’s a match, redirect to that content instead of showing the error. If there’s more than one match, the 
404 template can use some template tags to provide a list of suggestions to the visitor.
See the <a href="http://michael.tyson.id.au/smart-404" rel="nofollow ugc">Smart 404 homepage</a> for more information.
<h3>Template tags</h3>
<code>smart404_has_suggestions</code>
Returns true if there are some suggestions, false otherwise
<code>smart404_get_suggestions</code>
Retrieve an array of post objects for rendering manually.
<code>smart404_suggestions</code>
Draw a list of suggested posts.
Pass the parameter “list” to render suggestions as a list.
<code>smart404_loop</code>
Query posts for use in a Loop. Eg:
<pre><code><?php smart404_loop(); ?>
<?php while (have_posts()) : the_post(); ?>
 <h2><a href="<?php the_permalink() ?>"><?php the_title(); ?></a></h2>
 <?php the_excerpt(); ?>
<?php endwhile; ?>
</code></pre>
Note that the loop will not display pages correctly, as it is not built to support them. It is recommended that if you use 
a loop like that above, do not enable searching of pages.
<code>smart404_get_search_terms</code>
Retrieve an array of search terms used to populate the suggestions list, for use with contextual highlighting, etc.
For support and latest source code, please visit https://github.com/leonstafford/smart-404

Smart 404

Automatically redirect to the content the user was most likely after, or show suggestions, instead of showing an unhelpful 404 error.

Svetoslav Marinov

orbisius

If you have an existing website and you want to add category to your blog posts links (e.g. by using: /%category%/%postname%/ in Settings > Permalinks) then your visitors 
will most likely run into page not found errors. This plugin checks for such post links and redirects the visitor using permanent (301) redirect to the correct /Category/Permalink link IF the permalinks are setup.
This plugin assumes that you have previously used /%postname%/ in your Settings > Permalinks.
Demo 
http://www.youtube.com/watch?v=L124jV5joTk
Bugs? Suggestions? If you want a faster reponse contact us through our website’s contact form [ orbisius.com ] and not through the support tab of this plugin or WordPress forums. 
We don’t get notified when such requests get posted in the forums.
<a href="http://orbisius.com/go/intro2site?permalinks-to-categorypermalinks" rel="nofollow ugc">Free e-book: How to Build a Website Using WordPress: Beginners Guide</a>
<h4>Author</h4>
Svetoslav Marinov (Slavi) | <a href="http://orbisius.com" title="Custom Web Programming, Web Design, e-commerce, e-store, WordPress Plugin Development, Facebook and Mobile App Development in Niagara Falls, St. Catharines, Ontario, Canada" rel="nofollow ugc">Custom Web and Mobile Programming by Orbisius.com</a>

Permalinks to Category/Permalinks

While it may seem trivial, switching from permalinks to a prefix using a category is tough. Slavi's plugin works just as expected and works out of the box. Definitely recommended.

Works as expected, thanks!

The plugin automatically redirects users who have accessed a blog post link without the category to the one which has the category and therefore avoid …

Smart 404 vs Permalinks to Category/Permalinks