| Аргумент | Возможный тип | Описание |
| $addon | — | — |
$addon = strtolower((string)$addon);
if (empty($this->installed_modules)) {
$this->installed_modules = array();
$rows = $this->db->query("SELECT `code` FROM " . DB_PREFIX . "extension")->rows;
foreach ($rows as $row) {
$this->installed_modules[] = strtolower($row['code']);
}
}
return in_array($addon, $this->installed_modules);
