RE: [PHP] Overriding string concatenation '.'

[snip]
This is where i encounter the problem
$hostin="122.122.122.122";
$l=system('ssh '.$hostin.' ls');
echo $l;
[/snip]

Then your code should read

$hostin="122.122.122.122";
$l=system("ssh $hostin ls");
echo $l;