(PHP 4, PHP 5, PHP 7)
imap_clearflag_full — Clears flags on messages
imap_clearflag_full ( resource $imap_stream , string $sequence , string $flag [, int $options = 0 ] ) : bool
This function causes a store to delete the specified flag to the flags set for the messages in the specified sequence.
imap_stream
An IMAP stream returned by imap_open().
sequence
A sequence of message numbers. You can enumerate desired messages with the X,Y syntax, or retrieve all messages within an interval with the X:Y syntax
flag
The flags which you can unset are "\\Seen", "\\Answered", "\\Flagged", "\\Deleted", and "\\Draft" (as defined by » RFC2060)
options
options are a bit mask and may contain the single option:
ST_UID - The sequence argument contains UIDs instead of sequence numbers Returns true on success or false on failure.
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https://www.php.net/manual/en/function.imap-clearflag-full.php