Brad Parbs

surfboards

Quickly output a 404 for static files that aren’t found, rather than loading the normal 404 page.
Any static files ( images, text, pdfs, etc ) that don’t exist will 404 as soon as possible, rather than loading the entire WordPress application.
<h3>Details</h3>
By default, the list of extensions to check are the results of <code>wp_get_ext_types</code>, but can be filtered with <code>static_404_extensions</code>.
The output is a static page with the text <code>404 Not Found</code>, this text can be edited by filtering <code>static_404_message</code>.
A 404 status code will be used, but can be filtered with <code>static_404_response_code</code>.
Passing true to <code>static_404_should_process_request</code> will short-circuit and skip processing the request. This filter gets passed the current request.

Static 404

A WordPress plugin to quickly send a 404 for missing static files.

tamlyn

As a theme developer, you want to have WP_DEBUG enabled but you’re not interested in the deprecated warnings created by other plugins. Use this plugin to disable these messages while still displaying other errors, warnings and notices.
<a href="http://outlandishideas.co.uk/blog/2012/06/hide-deprecated-errors-in-wordpress/" rel="nofollow ugc">Plugin by Outlandish Ideas</a>

Disable Deprecated Warnings

Prevents plugins from showing deprecated errors in the WordPress admin.

Static 404 vs Disable Deprecated Warnings