Balances tags of string using a modified stack.

Escape single quotes, specialchar double quotes, and fix line endings.

Sanitizes the cookies sent to the user already.

Sets up global user vars.

Retrieve the file type from the file name.

Kills WordPress execution and displays HTML page with an error message.

Retrieve nonce action “Are you sure” message.

Gets current commenter’s name, email, and URL.

Retrieve original referer that was posted, if it exists.

Retrieve referer from ‘_wp_http_referer’ or HTTP referer.