CAllGroup::Update

public function Update($ID, $arFields)
{
	/** @global CMain $APPLICATION */
	global $DB, $APPLICATION, $CACHE_MANAGER;

	$ID = intval($ID);

	if(!$this->CheckFields($arFields, $ID))
		return false;

	foreach(GetModuleEvents("main", "OnBeforeGroupUpdate", true) as $arEvent)
	{
		$bEventRes = ExecuteModuleEventEx($arEvent, array($ID, &$arFields));
		if($bEventRes===false)
		{
			if($err = $APPLICATION->GetException())
				$this->LAST_ERROR .= $err->GetString()."
";
			else
				$this->LAST_ERROR .= "Unknown error in OnBeforeGroupUpdate handler."."
";
			return false;
		}
	}

	if($ID<=2)
		unset($arFields["ACTIVE"]);

	if(is_set($arFields, "ACTIVE") && $arFields["ACTIVE"]!="Y")
		$arFields["ACTIVE"]="N";

	$strUpdate = $DB->PrepareUpdate("b_group", $arFields);

	if(!is_set($arFields, "TIMESTAMP_X"))
		$strUpdate .= ", TIMESTAMP_X = ".$DB->GetNowFunction();


	$strSql = "UPDATE b_group SET $strUpdate WHERE ID=".$ID;
	if(is_set($arFields, "SECURITY_POLICY"))
	{
		if(COption::GetOptionString("main", "event_log_group_policy", "N") === "Y")
		{
			//get old security policy
			$aPrevPolicy = array();
			$res = $DB->Query("SELECT SECURITY_POLICY FROM b_group WHERE ID=".$ID);
			if(($res_arr = $res->Fetch()) && $res_arr["SECURITY_POLICY"] <> '')
				$aPrevPolicy = unserialize($res_arr["SECURITY_POLICY"], ['allowed_classes' => false]);
			//compare with new one
			$aNewPolicy = array();
			if($arFields["SECURITY_POLICY"] <> '')
				$aNewPolicy = unserialize($arFields["SECURITY_POLICY"], ['allowed_classes' => false]);
			$aDiff = array_diff_assoc($aNewPolicy, $aPrevPolicy);
			if(empty($aDiff))
				$aDiff = array_diff_assoc($aPrevPolicy, $aNewPolicy);
			if(!empty($aDiff))
				CEventLog::Log("SECURITY", "GROUP_POLICY_CHANGED", "main", $ID, print_r($aPrevPolicy, true)." => ".print_r($aNewPolicy, true));
		}
		$DB->QueryBind($strSql, array("SECURITY_POLICY"=>$arFields["SECURITY_POLICY"]), false);
	}
	else
	{
		$DB->Query($strSql, false, "FILE: ".__FILE__."
 LINE: ".__LINE__);
	}

	if(is_set($arFields, "USER_ID") && is_array($arFields["USER_ID"]))
	{
		$log = (COption::GetOptionString("main", "event_log_user_groups", "N") === "Y");
		if($log)
		{
			//remember users in the group
			$aPrevUsers = array();
			$res = $DB->Query("SELECT USER_ID FROM b_user_group WHERE GROUP_ID=".$ID.($ID=="1"?" AND USER_ID<>1":""));
			while($res_arr = $res->Fetch())
				$aPrevUsers[] = $res_arr["USER_ID"];
		}

		$DB->Query("DELETE FROM b_user_group WHERE GROUP_ID=".$ID.($ID=="1"?" AND USER_ID<>1":""));

		$arUsers = $arFields["USER_ID"];
		$arTmp = array();
		foreach($arUsers as $user)
		{
			if(!is_array($user))
				$user = array("USER_ID" => $user);

			$user_id = intval($user["USER_ID"]);
			if(
				$user_id > 0
				&& !isset($arTmp[$user_id])
				&& ($ID != 1 || $user_id != 1)
			)
			{
				$arInsert = $DB->PrepareInsert("b_user_group", $user);
				$strSql = "
					INSERT INTO b_user_group (
						GROUP_ID, ".$arInsert[0]."
					) VALUES (
						".$ID.", ".$arInsert[1]."
					)
				";
				$DB->Query($strSql, false, "FILE: ".__FILE__."
 LINE: ".__LINE__);
				$arTmp[$user_id] = true;
			}
		}
		$aNewUsers = array_keys($arTmp);
		CUser::clearUserGroupCache();

		if($log)
		{
			/** @noinspection PhpUndefinedVariableInspection */
			foreach($aPrevUsers as $user_id)
			{
				if(!in_array($user_id, $aNewUsers))
				{
					$UserName = '';
					$rsUser = CUser::GetByID($user_id);
					if($arUser = $rsUser->GetNext())
						$UserName = ($arUser["NAME"] != "" || $arUser["LAST_NAME"] != "") ? trim($arUser["NAME"]." ".$arUser["LAST_NAME"]) : $arUser["LOGIN"];
					$res_log = array(
						"groups" => "-(".$ID.")",
						"user" => $UserName
					);
					CEventLog::Log("SECURITY", "USER_GROUP_CHANGED", "main", $user_id, serialize($res_log));
				}
			}

			foreach($aNewUsers as $user_id)
			{
				if(!in_array($user_id, $aPrevUsers))
				{
					$UserName = '';
					$rsUser = CUser::GetByID($user_id);
					if($arUser = $rsUser->GetNext())
						$UserName = ($arUser["NAME"] != "" || $arUser["LAST_NAME"] != "") ? trim($arUser["NAME"]." ".$arUser["LAST_NAME"]) : $arUser["LOGIN"];
					$res_log = array(
						"groups" =>  "+(".$ID.")",
						"user" => $UserName
					);
					CEventLog::Log("SECURITY", "USER_GROUP_CHANGED", "main", $user_id, serialize($res_log));
				}
			}
		}
	}

	foreach (GetModuleEvents("main", "OnAfterGroupUpdate", true) as $arEvent)
		ExecuteModuleEventEx($arEvent, array($ID, &$arFields));

	if (defined("CACHED_b_group") && CACHED_b_group !== false)
		$CACHE_MANAGER->CleanDir("b_group");

	ModuleGroupTable::cleanCache();

	return true;
}