Using WordPress ‘get_blogaddress_by_id()’ PHP function

The get_blogaddress_by_id() WordPress PHP function retrieves a full blog URL, given a blog ID.

Usage

get_blogaddress_by_id( $blog_id );

Example:

$blog_id = 2;
$blog_url = get_blogaddress_by_id( $blog_id );
echo $blog_url; // Outputs "https://example.com/blog-2"

Parameters

$blog_id (int) – Required. The ID of the blog for which you want to retrieve the URL.

More information

See WordPress Developer Resources: get_blogaddress_by_id()

Examples

Display blog URL in a list

This code retrieves the URLs of all blogs in a multisite WordPress installation and displays them in an unordered list.

// Fetch all the blogs in a multisite installation
$blogs = get_sites();

echo '<ul>';
foreach ( $blogs as $blog ) {
    $blog_url = get_blogaddress_by_id( $blog->blog_id );
    echo '<li><a href="' . esc_url( $blog_url ) . '">' . esc_html( $blog_url ) . '</a></li>';
}
echo '</ul>';

Redirect users to their primary blog

This code redirects logged-in users to their primary blog.

// Check if user is logged in
if ( is_user_logged_in() ) {
    // Get the current user ID
    $user_id = get_current_user_id();

    // Get the primary blog ID of the current user
    $primary_blog_id = get_user_meta( $user_id, 'primary_blog', true );

    // Get the blog URL by blog ID
    $blog_url = get_blogaddress_by_id( $primary_blog_id );

    // Redirect the user to their primary blog
    wp_redirect( $blog_url );
    exit;
}

Display the blog URL in the admin area

This code adds a column to the Network Admin > Sites page, displaying the blog URL for each site.

// Add a custom column to the sites list table
add_filter( 'wpmu_blogs_columns', 'custom_blog_url_column' );
function custom_blog_url_column( $columns ) {
    $columns['blog_url'] = 'Blog URL';
    return $columns;
}

// Display the blog URL in the custom column
add_action( 'manage_sites_custom_column', 'display_custom_blog_url_column', 10, 2 );
function display_custom_blog_url_column( $column_name, $blog_id ) {
    if ( 'blog_url' === $column_name ) {
        $blog_url = get_blogaddress_by_id( $blog_id );
        echo esc_html( $blog_url );
    }
}

This code fetches the URLs of all blogs in a multisite installation and displays them in a dropdown menu.

// Fetch all the blogs in a multisite installation
$blogs = get_sites();

echo '<select name="blogs">';
foreach ( $blogs as $blog ) {
    $blog_url = get_blogaddress_by_id( $blog->blog_id );
    echo '<option value="' . esc_url( $blog_url ) . '">' . esc_html( $blog_url ) . '</option>';
}
echo '</select>';