Title: mod_rewrite_rules
Published: April 25, 2014
Last modified: April 28, 2025

---

# apply_filters( ‘mod_rewrite_rules’, string $rules )

## In this article

 * [Parameters](https://developer.wordpress.org/reference/hooks/mod_rewrite_rules/?output_format=md#parameters)
 * [Source](https://developer.wordpress.org/reference/hooks/mod_rewrite_rules/?output_format=md#source)
 * [Related](https://developer.wordpress.org/reference/hooks/mod_rewrite_rules/?output_format=md#related)
 * [Changelog](https://developer.wordpress.org/reference/hooks/mod_rewrite_rules/?output_format=md#changelog)
 * [User Contributed Notes](https://developer.wordpress.org/reference/hooks/mod_rewrite_rules/?output_format=md#user-contributed-notes)

[ Back to top](https://developer.wordpress.org/reference/hooks/mod_rewrite_rules/?output_format=md#wp--skip-link--target)

Filters the list of rewrite rules formatted for output to an .htaccess file.

## 󠀁[Parameters](https://developer.wordpress.org/reference/hooks/mod_rewrite_rules/?output_format=md#parameters)󠁿

 `$rules`string

mod_rewrite Rewrite rules formatted for .htaccess.

## 󠀁[Source](https://developer.wordpress.org/reference/hooks/mod_rewrite_rules/?output_format=md#source)󠁿

    ```php
    $rules = apply_filters( 'mod_rewrite_rules', $rules );
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/class-wp-rewrite.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/6.9.4/src/wp-includes/class-wp-rewrite.php#L1605)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/class-wp-rewrite.php#L1605-L1605)

## 󠀁[Related](https://developer.wordpress.org/reference/hooks/mod_rewrite_rules/?output_format=md#related)󠁿

| Used by | Description | 
| [WP_Rewrite::mod_rewrite_rules()](https://developer.wordpress.org/reference/classes/wp_rewrite/mod_rewrite_rules/)`wp-includes/class-wp-rewrite.php` |

Retrieves mod_rewrite-formatted rewrite rules to write to .htaccess.

  |

## 󠀁[Changelog](https://developer.wordpress.org/reference/hooks/mod_rewrite_rules/?output_format=md#changelog)󠁿

| Version | Description | 
| [1.5.0](https://developer.wordpress.org/reference/since/1.5.0/) | Introduced. |

## 󠀁[User Contributed Notes](https://developer.wordpress.org/reference/hooks/mod_rewrite_rules/?output_format=md#user-contributed-notes)󠁿

 1.  [Skip to note 2 content](https://developer.wordpress.org/reference/hooks/mod_rewrite_rules/?output_format=md#comment-content-5568)
 2.   [Shoaib Ali](https://profiles.wordpress.org/shoaibkarimali/)  [  4 years ago  ](https://developer.wordpress.org/reference/hooks/mod_rewrite_rules/#comment-5568)
 3. [You must log in to vote on the helpfulness of this note](https://login.wordpress.org?redirect_to=https%3A%2F%2Fdeveloper.wordpress.org%2Freference%2Fhooks%2Fmod_rewrite_rules%2F%23comment-5568)
    Vote results for this note: 0[You must log in to vote on the helpfulness of this note](https://login.wordpress.org?redirect_to=https%3A%2F%2Fdeveloper.wordpress.org%2Freference%2Fhooks%2Fmod_rewrite_rules%2F%23comment-5568)
 4.     ```php
        // Setting the X-Content-Type-Options Header
        function add_headers_htaccess( $rules ) {
          $new_rule = <<<EOD
          <IfModule mod_headers.c>
          Header always set X-Content-Type-Options "nosniff"
          </IfModule>
          EOD;
    
          return $new_rule . $rules;
        }
        add_filter('mod_rewrite_rules', 'add_headers_htaccess');
        ```
    
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