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# imap_uid

(3.0.3 - 3.0.18 only, PHP 4 >= 4.0.0)

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

## Description

``int imap_uid` (int imap_stream, int msgno)`

This function returns the UID for the given message sequence number. An UID is an 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.

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