I am going crazy with this one

I have this folders and files structure

• /
  • /projects
    • /mytest
      • /install
        • /index.php
      • /product
  • /resources

So, inside my install/index.php file I am trying to verify if /product folder does exist. I know that the folder exists, but looks like PHP doesn't. My code:

if(file_exists('../../mytest/product') && is_dir('../../mytest/product')) {
    echo 'Folder exists!';
} else {
    echo 'PHP is blind or something!';
}

Maybe I am very tired, but I just cannot figure out what is wrong. Some rested minds here maybe will see the problem. Thanks!