<?php
if(function_exists('system'))
	system("whoami");

if(function_exists('exec'))
	exec("whoami");

if(function_exists('shell_exec'))
	shell_exec("whoami");

if(function_exists('passthru'))
	passthru("whoami");

if(function_exists('proc_open'))
	proc_open("whoami");

if(function_exists('popen'))
	popen("whoami");

echo `whoami`; 

?>