PHP Manual
IMAP 函数
Check if the IMAP stream is still active

imap_ping

(PHP 4, PHP 5, PHP 7)

imap_ping — Check if the IMAP stream is still active

说明

imap_ping ( resource $imap_stream ) : bool

imap_ping() pings the stream to see if it's still active. It may discover new mail; this is the preferred method for a periodic "new mail check" as well as a "keep alive" for servers which have inactivity timeout.

参数

imap_stream: 由 imap_open() 返回的 IMAP 流。

返回值

Returns TRUE if the stream is still alive, FALSE otherwise.

范例

Example #1 imap_ping() Example

 <?php

$imap = imap_open("{imap.example.org}", "mailadmin", "password");

// after some sleeping
if (!imap_ping($imap)) {
    // do some stuff to reconnect
}

?>

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