is_super_admin

The timeline below displays how wordpress function is_super_admin has changed across different WordPress versions. If a version is not listed, refer to the next available version below.

WordPress Version: 6.1

/**
 * Determines whether user is a site admin.
 *
 * @since 3.0.0
 *
 * @param int|false $user_id Optional. The ID of a user. Defaults to false, to check the current user.
 * @return bool Whether the user is a site admin.
 */
function is_super_admin($user_id = false)
{
    if (!$user_id) {
        $user = wp_get_current_user();
    } else {
        $user = get_userdata($user_id);
    }
    if (!$user || !$user->exists()) {
        return false;
    }
    if (is_multisite()) {
        $super_admins = get_super_admins();
        if (is_array($super_admins) && in_array($user->user_login, $super_admins, true)) {
            return true;
        }
    } else if ($user->has_cap('delete_users')) {
        return true;
    }
    return false;
}

WordPress Version: 5.9

/**
 * Determine if user is a site admin.
 *
 * @since 3.0.0
 *
 * @param int|false $user_id Optional. The ID of a user. Defaults to false, to check the current user.
 * @return bool Whether the user is a site admin.
 */
function is_super_admin($user_id = false)
{
    if (!$user_id) {
        $user = wp_get_current_user();
    } else {
        $user = get_userdata($user_id);
    }
    if (!$user || !$user->exists()) {
        return false;
    }
    if (is_multisite()) {
        $super_admins = get_super_admins();
        if (is_array($super_admins) && in_array($user->user_login, $super_admins, true)) {
            return true;
        }
    } else if ($user->has_cap('delete_users')) {
        return true;
    }
    return false;
}

WordPress Version: 5.7

/**
 * Determine if user is a site admin.
 *
 * @since 3.0.0
 *
 * @param int|false $user_id Optional. The ID of a user. Defaults to false, to check the current user.
 * @return bool Whether the user is a site admin.
 */
function is_super_admin($user_id = false)
{
    if (!$user_id || get_current_user_id() == $user_id) {
        $user = wp_get_current_user();
    } else {
        $user = get_userdata($user_id);
    }
    if (!$user || !$user->exists()) {
        return false;
    }
    if (is_multisite()) {
        $super_admins = get_super_admins();
        if (is_array($super_admins) && in_array($user->user_login, $super_admins, true)) {
            return true;
        }
    } else if ($user->has_cap('delete_users')) {
        return true;
    }
    return false;
}

WordPress Version: 5.5

/**
 * Determine if user is a site admin.
 *
 * @since 3.0.0
 *
 * @param int $user_id (Optional) The ID of a user. Defaults to the current user.
 * @return bool True if the user is a site admin.
 */
function is_super_admin($user_id = false)
{
    if (!$user_id || get_current_user_id() == $user_id) {
        $user = wp_get_current_user();
    } else {
        $user = get_userdata($user_id);
    }
    if (!$user || !$user->exists()) {
        return false;
    }
    if (is_multisite()) {
        $super_admins = get_super_admins();
        if (is_array($super_admins) && in_array($user->user_login, $super_admins, true)) {
            return true;
        }
    } else if ($user->has_cap('delete_users')) {
        return true;
    }
    return false;
}

WordPress Version: 5.4

/**
 * Determine if user is a site admin.
 *
 * @since 3.0.0
 *
 * @param int $user_id (Optional) The ID of a user. Defaults to the current user.
 * @return bool True if the user is a site admin.
 */
function is_super_admin($user_id = false)
{
    if (!$user_id || get_current_user_id() == $user_id) {
        $user = wp_get_current_user();
    } else {
        $user = get_userdata($user_id);
    }
    if (!$user || !$user->exists()) {
        return false;
    }
    if (is_multisite()) {
        $super_admins = get_super_admins();
        if (is_array($super_admins) && in_array($user->user_login, $super_admins)) {
            return true;
        }
    } else if ($user->has_cap('delete_users')) {
        return true;
    }
    return false;
}

WordPress Version: 3.7

/**
 * Determine if user is a site admin.
 *
 * @since 3.0.0
 *
 * @param int $user_id (Optional) The ID of a user. Defaults to the current user.
 * @return bool True if the user is a site admin.
 */
function is_super_admin($user_id = false)
{
    if (!$user_id || $user_id == get_current_user_id()) {
        $user = wp_get_current_user();
    } else {
        $user = get_userdata($user_id);
    }
    if (!$user || !$user->exists()) {
        return false;
    }
    if (is_multisite()) {
        $super_admins = get_super_admins();
        if (is_array($super_admins) && in_array($user->user_login, $super_admins)) {
            return true;
        }
    } else if ($user->has_cap('delete_users')) {
        return true;
    }
    return false;
}