imap_uid

(PHP 4, PHP 5, PHP 7)

This function returns the UID for the given message sequence number

int imap_uid ( resource $imap_stream, int $msg_number )

This function returns the UID for the given message sequence number. An UID is a unique identifier that will not change over time while a message sequence number may change whenever the content of the mailbox changes.

This function is the inverse of imap_msgno().

Parameters:

imap_stream

An IMAP stream returned by imap_open().

msg_number

The message number.

Returns:

The UID of the given message.

Notes:

This function is not supported by POP3 mailboxes.