Inpsyde\MultilingualPress\API\WPDBContentRelations::has_site_relations PHP Method

    public function has_site_relations($site_id, $type = '')
    {
        $args = [$site_id];
        $query = "SELECT ml_id FROM {$this->table} WHERE ml_blogid = %d AND ml_source_blogid != ml_blogid";
        if ($type) {
            $query .= ' AND ml_type = %s';
            $args[] = $type;
        }
        return (bool) $this->db->query($this->db->prepare("{$query} LIMIT 1", $args));
    }