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# imap_ping

(PHP 3, PHP 4, PHP 5)

imap_ping -- Check if the IMAP stream is still active

## 说明

bool imap_ping ( resource imap_stream )

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`

  An IMAP stream returned by imap_open().

## 返回值

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

## 范例

例 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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