title: PHP "unable to stat" error message
body: <p>I often see this error message in my logs and it is pretty cryptic.  What does it mean when they say "unable to stat?"  Why does it happen?</p>
  
  <p>Here is an example error message:
  script /dir/dir/script_name.php' not found or unable to stat</p>
  
  <p>Thanks,
  Alex</p>