title: Cannot use 'String' as class name as it is reserved
body: <p><a href="https://i.stack.imgur.com/cezcD.png" rel="nofollow noreferrer">error message</a></p>
  
  <p>I want Generates a random string.And my develop environment is xampp with php7.0.9. because of references a String class, I got that error.</p>