(PHP 4 >= 4.3.3, PHP 5, PHP 7)
imap_timeout — Set or fetch imap timeout
imap_timeout ( int $timeout_type [, int $timeout = -1 ] ) : mixed
Sets or fetches the imap timeout.
timeout_type
One of the following: IMAP_OPENTIMEOUT, IMAP_READTIMEOUT, IMAP_WRITETIMEOUT, or IMAP_CLOSETIMEOUT.
timeout
The timeout, in seconds.
If the timeout parameter is set, this function returns true on success and false on failure.
If timeout is not provided or evaluates to -1, the current timeout value of timeout_type is returned as an integer.
Example #1 imap_timeout() example
<?php echo "The current read timeout is " . imap_timeout(IMAP_READTIMEOUT) . "\n"; ?>
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https://www.php.net/manual/en/function.imap-timeout.php