Variable Dump - echo all variables in a script

When de-bugging, it is good to know what variables are available at any one part of the script.

So I often echo out the variables, sometimes having them showing as html comments on the source of the page so as to not to disturb the page content.

```var_dump(get_defined_vars());

' . htmlspecialchars(print_r(get_defined_vars(), true)) . ''; print '

' . htmlspecialchars(print_r($_SERVER, true)) . '

'; ?>

```

(copying some old posts from an forum of mine that I wish to keep)