imap_uid

This function returns the UID for the given message sequence number (PHP 3>= 3.0.3, PHP 4 )
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().

Note:

This is not supported by POP3 mailboxes.

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