imap_undelete

Unmark the message which is marked deleted (PHP 3, PHP 4, PHP 5)
bool imap_undelete ( resource imap_stream, int msg_number [, int flags] )

This function removes the deletion flag for a specified message, which is set by imap_delete() or imap_mail_move().

如果成功则返回 TRUE,失败则返回 FALSE

See also: imap_delete(), and imap_mail_move().