(PHP 4, PHP 5, PHP 7)
imap_msgno — Gets the message sequence number for the given UID
imap_msgno ( resource $imap_stream , int $uid ) : int
Returns the message sequence number for the given uid
.
This function is the inverse of imap_uid().
imap_stream
An IMAP stream returned by imap_open().
uid
The message UID
Returns the message sequence number for the given uid
.
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https://www.php.net/manual/en/function.imap-msgno.php