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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

## 说明

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().

## 参数

`imap_stream`

  An IMAP stream returned by imap_open().

`msg_number`

  The message number.

## 返回值

The UID of the given message.

## 注释

> 注意: This function is not supported by POP3 mailboxes.

## 参见

imap_msgno()

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