php explode file mkdir

    

$destination_path = getcwd().DIRECTORY_SEPARATOR;

 $explode_mision = explode("_", $_FILES["myfile"]["name"]);

 $upload = 'upload';
 

 $path = dirname(__FILE__);

    $dir1 = $path.'/'.$upload;
    if(!file_exists($dir1)) mkdir($dir1);

        $dir2 = $path.'/'.$upload.'/'.  explode_mision[0];
        if(!file_exists($dir2)) mkdir($dir2); //    mkdir($mision[0],0777,TRUE);