Sometimes we are required to do some troubleshooting on a production site.
In order to do that *safely* we'll show debug information only for us.
This could be put into a safe_debug function for later use by the way.
On development/staging servers I recommend installing debuggers such as Zend Debugger, xdebug etc and enabling errors (E_ALL).

[code language="php"]
if ($_SERVER['REMOTE_ADDR'] == '' || preg_match('#^192.#', $_SERVER['REMOTE_ADDR'])) {
echo "Dev dump";
echo "

echo "

echo __FILE__ . ':' . __LINE__;

Of course one should be extra careful for opening and closing php tags otherwise this will product fatal errors.

Happy debugging!

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