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Table of Contents
Use flush_rewrite_rules() function
When should I refresh the rewrite rules?
Some things to note when refreshing rules
Alternative method: access the permalink page
Home CMS Tutorial WordPress How to flush rewrite rules programmatically

How to flush rewrite rules programmatically

Jun 27, 2025 am 12:21 AM
flush

In WordPress, when adding a custom article type or modifying the fixed link structure, you need to manually refresh the rewrite rules. At this time, you can call the flush_rewrite_rules() function through the code to implement it. 1. This function can be added to the theme or plug-in activation hook to automatically refresh; 2. Execute only once when necessary, such as adding CPT, taxonomy or modifying the link structure; 3. Avoid frequent calls to avoid affecting performance; 4. In a multi-site environment, refresh each site separately as appropriate; 5. Some hosting environments may restrict the storage of rules. In addition, clicking Save to access the "Settings>Pinned Links" page can also trigger refresh, suitable for non-automated scenarios.

Sometimes you need to manually refresh the rewrite rules in WordPress through code. For example, when you add a custom article type or modify the permalink structure, you hope to take effect the new rules without clicking Save on the "Settings> Permalink" page. In this case, the refresh of the rewrite rule can be triggered through program mode.

This is actually very simple, but many people don’t know when or how to use it.


Use flush_rewrite_rules() function

This is the most direct way. WordPress provides a built-in function: flush_rewrite_rules() , which regenerates and saves all current rewrite rules.

You can use it in the activation hook of a theme or plugin, for example:

 function my_custom_flush_rewrite_rules() {
    // Register custom article types or other logic that affects rewriting flush_rewrite_rules();
}
register_activation_hook( __FILE__, 'my_custom_flush_rewrite_rules' );

Note: Don't call this function every time the page loads , as this can cause performance issues and may even throw 500 errors.


When should I refresh the rewrite rules?

Several common situations include:

  • Added a new custom post type (CPT)
  • Added custom taxonomy (Taxonomy)
  • Modified the fixed link structure of existing article types
  • Plugins rely on specific rewrite rules (such as mall-like plugins)

These changes are not automatically applied to .htaccess or internal rule cache unless you manually access the "Pinline Links" page, or trigger a refresh via code.


Some things to note when refreshing rules

  • Execute only once if necessary , such as when plug-in or theme activation/installation.
  • If you only modify the template file or CSS, you do not need to refresh the rewrite rules.
  • If you are developing in a multi-site environment, remember to check whether you need to refresh individually for each site.
  • Some hosting environments may limit the write permissions of .htaccess , and the rules may not be saved after refreshing.

If you don't want to write code, the easiest way is to log in to the background, go to "Settings > Permalinks", and click "Save Changes". This operation will also trigger flush_rewrite_rules() .

However, for automated deployment or plug-ins, it is still recommended to use code to process it.


Basically that's it. The rational use of flush_rewrite_rules() can make your website more flexible in responding to URL structure changes, but don't abuse it.

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