php实现ping

<?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);

}

?>