Function and usage of get_subdirectory_reserved_names() in wordpress


Answers ( 1 )


    The get_subdirectory_reserved_names() function in WordPress is designed for use in a Multisite installation, specifically when you are using a sub-directory configuration. Let's break down its functionality and usage:


    • Name: get_subdirectory_reserved_names()
    • Purpose: Retrieves a list of reserved names that cannot be used as site names on a sub-directory Multisite installation in WordPress.
    • Context: This function is particularly useful in a WordPress Multisite network to prevent the creation of sites with names that might conflict with existing WordPress paths or reserved keywords.


    • Type: string[] (Array of strings)
    • Description: The function returns an array of strings. Each string in the array is a reserved name that should not be used for a sub-site in a sub-directory Multisite installation.

    Sample Usage:

    In a WordPress Multisite installation, you might want to check if a user-provided name for a new site is reserved or not. Here's how you could use get_subdirectory_reserved_names() in such a scenario:

    // Get the list of reserved subdirectory names
    $reserved_names = get_subdirectory_reserved_names();
    // Assume $new_site_name is the name provided by the user for a new site
    $new_site_name = 'example';
    // Check if the provided name is in the list of reserved names
    if (in_array($new_site_name, $reserved_names)) {
        echo 'This site name is reserved. Please choose a different name.';
    } else {
        echo 'This site name is available.';

    In this example, the $reserved_names variable holds the array of reserved names. The in_array() function checks if $new_site_name is in the list of reserved names. If it is, a message is displayed indicating that the name is reserved; otherwise, a message confirms that the name is available.

    This function is a part of WordPress's internal mechanisms to ensure site names do not conflict with WordPress's reserved routes or special keywords, which is crucial for the smooth operation and routing within a WordPress Multisite network.

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