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AddEventHandler("crm", 'onBeforeCrmInvoiceSetStatus' , Array('Text', 'onBeforeCrmInvoiceSetStatus'));

class Text
{
   public static function onBeforeCrmInvoiceSetStatus(&$arFields)
   {
      ob_start();
      echo "<pre>";
      var_dump($arFields);
      echo "</pre>";
      file_put_contents('/home/bitrix/www/bitrix/php_interface/test1.txt', ob_get_clean(), FILE_APPEND);
      return true;
   }

}

public static function