I assume Over here, $var doesnt work means $var has nothing in it.

Did you tried printing the $var to a file?

When you said print $var, it prints the contents to the STDOUT, which is captured by the system function in PHP. So print $var seems not printing anything, but actually it has the output.

$bar=$ARGV[0];
$lak=system($bar);
print $lak; #This will be captured by the system function in the PHP f
+ile.
open FH,">> llll";
print FH $lak;
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Now the file will also have the output