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