Function: Escapes an HTML tag name.

Function: Trims text to a certain number of words.

Function: Converts named entities into numbered entities.

Function: Formats text for the editor.

Function: Performs a deep string replace operation to ensure the values in $search are no longer present.

Function: Escapes data for use in a MySQL query.

Function: Checks and cleans a URL.

Function: Sanitizes a URL for database or redirect usage.

Function: Converts entities, while preserving already-encoded entities.