php实现ping命令

<?php

// created by joe lumbroso
// see some other good php3 scripts
// goto http://www.dtheatre.com/scripts

echo "<font color=\"red\"><blink><b>Pinging</b></blink></font><br>";
＄to_ping = "dtheatre.com";
＄count = 3;
＄psize = 65;
echo " Please be patient, this can take a few moments...\n<br><br>";
flush();

while (1) {
?>
<pre>
<?
exec("ping -c ＄count -s ＄psize ＄to_ping", ＄list);
for (＄i=0;＄i < count(＄list);＄i++) {
print ＄list[＄i]."\n";
}
?>
</pre>
<?
flush();
sleep(3);
}
?>