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here is the fix...

$cmd = "/bin/ping -c 5 ".$_SERVER['REMOTE_ADDR'];
$ping = shell_exec($cmd); 

if(strlen($ping) < 5)
{ 
echo "? ms";
}
else
{
preg_match("/rtt min\/avg\/max\/mdev = (.*)\/(.*)\/(.*)\/(.*) ms/", $ping, $matches);
$urping = number_format($matches[1],0)." ms";
}

You said you wanted to get the ping response from the client to the server. That's a ping from the server to the client, which you specifically said you didn't want. It's probably the best you'll be able to get without the user installing anything, though.

This thread is more than a year old. Please don't revive it unless you have something important to add.

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