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(PHP 4, PHP 5, PHP 7)
imap_ping — Check if the IMAP stream is still active
$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.
imap_stream
由 imap_open() 返回的 IMAP 流。
Returns TRUE
if the stream is still alive, FALSE
otherwise.
Example #1 imap_ping() Example
<?php
$imap = imap_open ( "{imap.example.org}" , "mailadmin" , "password" );
// after some sleeping
if (! imap_ping ( $imap )) {
// do some stuff to reconnect
}
?>
[#1] [2002-12-27 16:28:33]
This is a great solution for a webmail class if you want to make sure that a user is still logged in. Example:
<?php
if(!(imap_ping($stream)) {
die("The user is no longer logged in.");
?>