CCrmEvent::Delete

public function Delete($ID, $arOptions = array())
{
	global $USER;

	if(isset($arOptions['CURRENT_USER']))
	{
		$iUserId = intval($arOptions['CURRENT_USER']);
	}
	else
	{
		$iUserId = $USER->GetId();
	}

	$err_mess = (self::err_mess()).'
Function: Delete
Line: ';

	$ID = intval($ID);

	$db_events = GetModuleEvents('crm', 'OnBeforeCrmEventDelete');
	while($arEvent = $db_events->Fetch())
		ExecuteModuleEventEx($arEvent, array($ID));

	// if not admin - delete only self items
	if (!CCrmPerms::IsAdmin($iUserId))
	{
		$sql = "SELECT CER.ID
				FROM
					b_crm_event_relations CER,
					b_crm_event CE
				WHERE
					CE.ID = CER.EVENT_ID
				AND CER.ID = '$ID'
				AND CER.ASSIGNED_BY_ID = '".$iUserId."' AND CE.EVENT_TYPE = 0";
		$res = $this->cdb->Query($sql, false, $err_mess.__LINE__);
		if (!$res->Fetch())
			return false;
	}

	// check unrelated events
	$sql = "SELECT EVENT_ID, COUNT(ID) as CNT
			FROM b_crm_event_relations
			WHERE EVENT_ID = (SELECT EVENT_ID FROM b_crm_event_relations WHERE ID = '$ID')
			GROUP BY EVENT_ID";
	$res = $this->cdb->Query($sql, false, $err_mess.__LINE__);
	if ($row = $res->Fetch())
	{
		// delete event
		if ($row['CNT'] == 1)
		{
			$obRes = $this->cdb->Query("SELECT ID, FILES FROM b_crm_event WHERE ID = '$row[EVENT_ID]'", false, $err_mess.__LINE__);
			if (($aRow = $obRes->Fetch()) !== false)
			{
				if (($arFiles = unserialize($aRow['FILES'], ['allowed_classes' => false])) !== false)
				{
					foreach ($arFiles as $iFileId)
						CFile::Delete((int) $iFileId);
				}
				$this->cdb->Query("DELETE FROM b_crm_event WHERE ID = '$row[EVENT_ID]'", false, $err_mess.__LINE__);
			}
		}
	}
	// delete event relation
	$res = $this->cdb->Query("DELETE FROM b_crm_event_relations WHERE ID = '$ID'", false, $err_mess.__LINE__);

	return $res;
}