Description:

Zend_Layout implements a classic Two Step View pattern, allowing
developers to wrap application content within another view, usually
representing the site template. Such templates are often termed
layouts by other projects, and Zend Framework has adopted this term
for consistency.

The main goals of Zend_Layout are as follows:
- Automate selection and rendering of layouts when used with the Zend
Framework MVC components.
- Provide separate scope for layout related variables and content.
- Allow configuration, including layout name, layout script resolution
(inflection), and layout script path.
- Allow disabling layouts, changing layout scripts, and other states;
allow these actions from within action controllers and view scripts.
- Follow same script resolution rules (inflection) as the
ViewRenderer, but allow them to also use different rules.
- Allow usage without Zend Framework MVC components.