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Debug WordPress 404 issues (permalinks, rewrite rules, etc.)
/* Produces a dump on the state of WordPress when a not found error occurs */
/* useful when debugging permalink issues, rewrite rule trouble, place inside functions.php */
ini_set( 'error_reporting', -1 );
ini_set( 'display_errors', 'On' );
echo '<pre>';
add_action( 'parse_request', 'debug_404_rewrite_dump' );
function debug_404_rewrite_dump( &$wp ) {
global $wp_rewrite;
echo '<h2>rewrite rules</h2>';
echo var_export( $wp_rewrite->wp_rewrite_rules(), true );
echo '<h2>permalink structure</h2>';
echo var_export( $wp_rewrite->permalink_structure, true );
echo '<h2>page permastruct</h2>';
echo var_export( $wp_rewrite->get_page_permastruct(), true );
echo '<h2>matched rule and query</h2>';
echo var_export( $wp->matched_rule, true );
echo '<h2>matched query</h2>';
echo var_export( $wp->matched_query, true );
echo '<h2>request</h2>';
echo var_export( $wp->request, true );
global $wp_the_query;
echo '<h2>the query</h2>';
echo var_export( $wp_the_query, true );
add_action( 'template_redirect', 'debug_404_template_redirect', 99999 );
function debug_404_template_redirect() {
global $wp_filter;
echo '<h2>template redirect filters</h2>';
echo var_export( $wp_filter[current_filter()], true );
add_filter ( 'template_include', 'debug_404_template_dump' );
function debug_404_template_dump( $template ) {
echo '<h2>template file selected</h2>';
echo var_export( $template, true );
echo '</pre>';

There is a single quote missing in line 19.


soulseekah commented May 3, 2012

@marlonlamancio, fixed, thanks! :)

Very useful, thanks!


ghost commented Jul 12, 2013

Was also getting 404 error I found this little nugget in the Centos 6 httpd.conf under the section. Just hit page down like 2 or three times and you will find this. I made a quick article here with more details.

AllowOverride controls what directives may be placed in .htaccess files.

It can be “All”, “None”, or any combination of the keywords:

Options FileInfo AuthConfig Limit

AllowOverride none

zhengtu commented Mar 2, 2016

it's really solve my issue, thank you.

Hi, thanks for the code snippet. I'm just wondering what file I should place it in :-/

db306 commented Oct 10, 2016

@frogFangio it's written in Line 2. But in any case you can place this in any .php file within your theme. You could require a file in your inc folder and place it within 404debug.php so you don't end up with a 3000 line in functions.php

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