What does the "~" sign mean in 1C-Bitrix?

Question

1C-Bitrix

There is a CPosting class for mailing. It has a property EMAIL_FILTER - tobish address filter. The code says:
$arFields = Array(
"FROM_FIELD" => $email_from,
"EMAIL_FILTER" => "[email protected],[email protected]",
"SUBJECT" => $subj,
"BODY_TYPE" => ($arFields['DETAIL_TEXT_TYPE'] <> "html"? "text":"html"),
"BODY" => $message,
"DIRECT_SEND" => "Y",
"CHARSET" => $charset,
"SUBSCR_FORMAT" => $arFields['DETAIL_TEXT_TYPE'],
"GROUP_ID" =>Array(7),
"
Question: what does the ~ sign mean before addresses? It is likely that this is a logical NOT. But if you put another address, the mailing does not work. Help me figure it out, I will be very grateful))

Answer 1

The tilde actually means logical NOT. But in order for the filter to work, you need to list the addresses separated by a space, but this only works for two addresses, if there are more than two, you need to separate the sign &&
~mail && ~mail && ~mail

Answer 2

it is strange that here dev.1c-bitrix.ru/learning/course/index.php?COURSE_... is not written about this modifier