Using WordPress ‘is_multisite()’ PHP function

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The is_multisite() WordPress PHP function checks if a WordPress installation is running on Multisite mode.

Usage

$is_multisite_enabled = is_multisite();

Parameters

  • None

More information

See WordPress Developer Resources: is_multisite()

Examples

Check if Multisite is enabled

In this example, we check if Multisite is enabled and display a message accordingly.

if (is_multisite()) {
    echo 'Multisite is enabled!';
} else {
    echo 'Multisite is not enabled.';
}

Custom function to get site count

In this example, we create a custom function that returns the number of sites in a Multisite installation if it is enabled.

function get_site_count() {
    if (is_multisite()) {
        $site_count = get_blog_count();
        return $site_count;
    } else {
        return 'Multisite is not enabled.';
    }
}

echo get_site_count();

Conditional loading of a plugin

In this example, we only load a plugin if Multisite is enabled.

if (is_multisite()) {
    include_once('my-multisite-plugin.php');
}

Custom function to get a list of site admins

In this example, we create a custom function that returns a list of site administrators if Multisite is enabled.

function get_site_admins() {
    if (is_multisite()) {
        $site_admins = get_super_admins();
        return $site_admins;
    } else {
        return 'Multisite is not enabled.';
    }
}

$admins = get_site_admins();
print_r($admins);

Show different widgets based on Multisite status

In this example, we display a different set of widgets if Multisite is enabled.

if (is_multisite()) {
    dynamic_sidebar('multisite-sidebar');
} else {
    dynamic_sidebar('single-site-sidebar');
}