(PHP 4, PHP 5, PHP 7)
imap_num_recent — Gets the number of recent messages in current mailbox
imap_num_recent ( resource $imap_stream ) : int
Gets the number of recent messages in the current mailbox.
imap_stream
An IMAP stream returned by imap_open().
Returns the number of recent messages in the current mailbox, as an integer.
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https://www.php.net/manual/en/function.imap-num-recent.php