imap_uid

(PHP 3 >= 3.0.3, PHP 4, PHP 5)

imap_uid --  This function returns the UID for the given message sequence number

Description

int imap_uid ( resource imap_stream, int msgno )

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().

Note: This is not supported by POP3 mailboxes.

See also: imap_msgno().