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is it possible to regenerate the slugs programmatically after changing the titles of the post? Numerous post titles were updated and the slug was not updated with the title so I need to regenerate all these slugs.

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I have had to do this several times and found that between different server environments where it can't handle large arrays ( with numberposts being set to unlimited ) nor calling wp_update_post repeatedly with large memory consumption that breaking it into a WP_Query call with pagination and using $wpdb that it is more manageable and performant. I provided the code sample on a similar post. – codearachnid Feb 27 '14 at 3:14
up vote 7 down vote accepted

Yes, it is possible.

Sample code, has to be tested and refined:

// get all posts
$posts = get_posts( array (  'numberposts' => -1 ) );

foreach ( $posts as $post )
    // check the slug and run an update if necessary 
    $new_slug = sanitize_title( $post->post_title );
    if ( $post->post_name != $new_slug )
            array (
                'ID'        => $post->ID,
                'post_name' => $new_slug

I just made this up, there are probably some errors and egde cases, but it should give you an idea. Also, this may take a while, so it could be useful to split the update into smaller chunks.

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Hmmm... from my experience, this doesn't work. The post_name argument is ignored by the wp_update_post, at least in the 3.9 version of the core – Alexandre Bourlier Sep 4 '14 at 13:55

This plugin also does the job: http://www.jerrytravis.com/598/wordpress-plugin-to-generate-post-slugs

However, as it only does it for posts which don't have a slug yet, if you need to regenerate slugs edit the following line in the plugin:

if ($post->post_name == "") {

for example, you could change it to:

if (true) {

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I was trying the method suggested by Toscho, which is the "instinctive one", but in many cases it doesn't work (cf the core code to get what I mean by "many cases").

Looking in the code, I found the wp_insert_post_data filter hook, called by the wp_update_post function right before inserting the post iunto the database.

By calling this filter, and changing the value of $data['post_name'], I was able to get this to work properly. Wordpress is cool but so badly documented...

I edited the documentation, so that more people can find this workaround if needed.

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Can you point out why wp_update_post overwrites the post_name? the only reason I see for this to happen is if the user trying to modify the post_name is only a contributor (or same level) in which case it shouldn't allow that user to change slug, did you find any other cases in which the post_name is overwritten? – jnhghy - Jantea Alexandru Oct 16 '14 at 7:32

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