(PHP 4, PHP 5, PHP 7, PHP 8)
imap_alerts — Returns all IMAP alert messages that have occurred
Returns 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.
此函数没有参数。
Returns an array of all of the IMAP alert messages generated or false if
no alert messages are available.