Function and usage of avoid_blog_page_permalink_collision() in wordpress


Answers ( 1 )


    The avoid_blog_page_permalink_collision() function in WordPress is designed to prevent a conflict between the slug of a site (in a subdirectory installation) and the permalink slug of a post. This is particularly important in a WordPress multisite environment where each site may be installed in a separate subdirectory.

    Function Signature:

    avoid_blog_page_permalink_collision( array $data, array $postarr ): array


    • In WordPress, especially in a multisite setup, each site can have its own subdirectory.
    • Posts within these sites also have permalinks which are essentially the URL slugs.
    • There is a possibility that a post's permalink might accidentally match the slug of a site. This would cause a URL conflict, leading to incorrect page routing or a 404 error.
    • The avoid_blog_page_permalink_collision() function checks for such potential conflicts.


    1. $data (array, required): This is an array of post data. It includes various pieces of information about the post, such as its slug, title, content, etc.

    2. $postarr (array, required): This array contains a collection of posts. In the current implementation of the function, this parameter is not used, but it is kept for potential future use or extension compatibility.


    • array: The function returns a modified array of post data after checking for collisions. If a collision is detected, the function will typically alter the post slug to avoid the conflict.

    Sample Usage:

    Imagine you are creating a new post in a WordPress multisite environment, and you want to ensure that its permalink does not conflict with any of the site slugs.

    // Sample post data
    $data = [
        'post_name' => 'my-new-post', // The slug of the post
        // other post data...
    // Post array - currently not used by the function but required for the signature
    $postarr = [
        // Collection of post data...
    // Avoiding permalink collision
    $new_data = avoid_blog_page_permalink_collision($data, $postarr);
    // $new_data contains the post data with a modified slug if there was a collision

    In this example, $new_data will be the same as $data if there is no collision. If a collision is detected, $new_data['post_name'] (the slug) will be altered to avoid the conflict, ensuring that your site's URLs remain unique and navigable.

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