imap_alerts

This function returns all IMAP alert messages (if any) that have occurred during this page request or since the alert stack was reset (PHP 3 >= 3.0.12, PHP 4, PHP 5)
array imap_alerts ( )

This function returns an array of all of the IMAP alert messages generated since the last imap_alerts() call, or the beginning of the page. When imap_alerts() is called, the alert stack is subsequently cleared. The IMAP specification requires that these messages be passed to the user.