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is it possible to regenerate the slugs programmatically after changing the titles of the post?
The girl that updated the title of more than 200 posts just "forgot" to update the slug too, so i was wondering if there was some sort of plugin that regenerates the slugs from the new titles

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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 at 3:14

3 Answers 3

up vote 4 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 )
    {
        wp_update_post(
            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 –  Euloiix Sep 4 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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