Error in PHP function
I have this little script, which should ping the IPs in the $hosts_to_ping
array. This PHP is called with JavaScript in the index.html.
But something is wrong, because the $rval
is always 1 (which mean the host is unreachable). But I know that the first two host are alive.
So I print the $res
variable,开发者_运维技巧 and I see the message: Need to give the IP
. I don't understand why it doesn't replace the $host
variable to the actual IP address in the function.
<?php
function ping($host) {
exec(sprintf('ping -n 4', escapeshellarg($host)), $res, $rval);
print_r($res);
return $rval === 0;
}
$hosts_to_ping = array('10.54.23.254', '10.22.23.254', '10.23.66.134');
?>
<ul>
<?php foreach ($hosts_to_ping as $host): ?>
<li>
<?php echo $host; ?>
<?php $up = ping($host); ?>
(<img src="<?php echo $up ? 'on' : 'off'; ?>"
alt="<?php echo $up ? 'up' : 'down'; ?>">)
</li>
<?php endforeach; ?>
</ul>
At this line:
exec(sprintf('ping -n 4', escapeshellarg($host)), $res, $rval);
sprintf won't interpolate escapeshellarg($host)
in the string because you missed the %s. Replace that line with:
exec(sprintf('ping -n 4 %s', escapeshellarg($host)), $res, $rval);
Try this and see if it works.
That's because you don't replace anything in your sprintf. It probably should look like this to make it work : exec(sprintf('ping -n 4 %s', escapeshellarg($host)), $res, $rval);
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