The `FormatAbstract` class implements the [`FormatInterface`](../08_Format_API/02_FormatInterface.md) interface with basic functional behavior and adds common helper functions for new formats: * [setContentType](#the-setcontenttype-function) * [callContentType](#the-callcontenttype-function) * [sanitizeHtml](#the-sanitizehtml-function) * [array_trim](#the-array_trim-function) # Functions ## The `setContentType` function The `setContentType` function receives a string defining the content type for the HTML header and must return the object instance. ```PHP setContentType(string): self ``` ## The `callContentType` function The `callContentType` function applies the content type to the header data and must return the object instance. ```PHP callContentType(): self ``` ## The `sanitizeHtml` function The `sanitizeHtml` function receives an HTML formatted string and returns the string with disabled `