Function: Callback to add a target attribute to all links in passed content.

Function: Normalizes EOL characters and strips duplicate whitespace.

Function: Escaping for textarea values.

Function: Escapes an HTML tag name.

Function: Sanitizes various option values based on the nature of the option.

Function: Maps a function to all non-iterable elements of an array or an object.

Function: Parses a string into variables to be stored in an array.

Function: Converts lone less than signs.

Function: Callback function used by preg_replace.