Removes non-allowable HTML from parsed block attribute values when filtering in the post context.

Converts lone less than signs.

Callback function used by preg_replace.

Callback to add a rel attribute to HTML A element.

Adds rel="nofollow" string to all HTML A elements in content.

Callback to add rel="nofollow" string to HTML A element.

Adds rel="nofollow ugc" string to all HTML A elements in content.

Removes all filters modifying the rel attribute of targeted links.

Replaces characters or phrases within HTML elements only.

Adds slashes to a string or recursively adds slashes to strings within an array.