How do I force my script to exit after 5 seconds?

[Aaron Gould <webdevel@xxxxxxxxxxxxxxx>]

I have a script that connects to a networked device via PHP's socket 
functions.  This device accepts proprietary commands (e.g.: "KPRINT", as 
seen below), and returns data.  However, this device does not have any 
sort of "EXIT" command to end the processing of events.  So it 
essentially loops forever.

I do know that if this device does not return anything after 5 seconds, 
it will never return anything.

So, my question is:  how can I force this script to stop after 5 seconds 
has elapsed?

Here's the script:

============================================================
$fp = fsockopen('192.168.3.25', 10001, $errno, $errstr, 5);

if (!$fp) {
    echo 'Error...';
} else {
    $command = "KPRINT\r\n";

    fwrite($fp, $command);

    while (!feof($fp)) {
        $buffer = fgets($fp, 1024);
    }

    fclose($fp);
}
============================================================

Thanks!

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