PHP Manual
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# 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 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().

> 注: This is not supported by POP3 mailboxes.

See also: imap_msgno().

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