Function and usage of get_id_from_blogname() in wordpress


Answers ( 1 )


    The get_id_from_blogname() function in WordPress is a utility function used for multisite installations. This function is particularly useful when working with a network of sites within a single WordPress installation, where each site is usually differentiated by a subdomain or a subdirectory.

    Here's a detailed explanation of the function:

    Function Prototype

    get_id_from_blogname( string $slug ): int|null


    • Function: Retrieves a site’s ID given its slug.
    • Use Case: It's used in WordPress multisite environments to find the unique identifier (ID) of a site within the network based on its slug.


    • $slug (string, required): The slug of the site. A slug is a part of the URL that identifies a particular site in the network. It could be a subdomain (like or a subdirectory (like This parameter expects just the slug part (site1 in these examples).


    • Type: int|null
    • Description: Returns the site ID (which is an integer) if a site with the given slug is found in the network. If no site matches the given slug, it returns null.

    Sample Usage

    Here's an example of how you might use get_id_from_blogname() in a WordPress multisite environment:

    // Assume you want to find the ID of a site with the slug 'team-blog'
    $slug = 'team-blog';
    // Use the function to retrieve the site ID
    $site_id = get_id_from_blogname($slug);
    // Check if a site with that slug exists
    if ( $site_id !== null ) {
        echo "The ID of the site with the slug 'team-blog' is: " . $site_id;
    } else {
        echo "No site found with the slug 'team-blog'";


    • This function is only relevant in a WordPress multisite setup.
    • It's a part of WordPress's multisite-specific functionality, allowing for efficient management and retrieval of information across a network of sites.

    Remember to always check if the function exists before using it, as it's specific to WordPress multisite installations and might not be available in all WordPress environments.

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