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Zend_Acl provides lightweight and flexible access control list (ACL) functionality and privileges management. In general, an application may utilize such functionality to control access to certain protected objects by other requesting objects.

Zend_Cache provides a generic way to cache any data. Caching in Zend Framework is operated by frontends while cache records are stored through backend adapters (File, Sqlite, Memcache...) through a flexible system of IDs and tags. Using those, it is easy to delete specific types of records afterwards (for example: "delete all cache records marked with a given tag").

Zend_Config is designed to simplify access to and use of configuration data within applications. It provides a nested object property based user interface for accessing such configuration data within application code. The configuration data may come from a variety of media supporting hierarchical data storage. Currently Zend_Config provides adapters for configuration data that are stored in text files with Zend_Config_Ini and Zend_Config_Xml.

Zend_Controller provides the foundation for building a website based on the Model-View-Controller (MVC) pattern. The Zend_Controller system is designed to be lightweight, modular, and extensible. It is a minimalist design to permit flexibility and some freedom to users while providing enough structure so that systems built around Zend_Controller share some common conventions and similar code layout. The Zend_Controller workflow is implemented by several components. While it is not necessary to completely understand the underpinnings of all of these components to use the system, having a working knowledge of the process is helpful.

The Zend_Date component offers a detailed, but simple API for manipulating dates and times. Its methods accept a wide variety of types of information, including date parts, in numerous combinations yielding many features and possibilities above and beyond the existing PHP date related functions. For the very latest manual updates, please see our online manual (frequently synced to Subversion). Although simplicity remains the goal, working with localized dates and times while modifying, combining, and comparing parts involves some unavoidable complexity. Dates, as well as times, are often written differently in different locales. For example, some place the month first, while other write the year first when expressing calendar dates. For more information about handling localization and normalization, please refer to Zend_Locale .

Zend_Db_Adapter is the database API abstraction layer for the Zend Framework. Based on PDO, you can use Zend_Db_Adapter to connect to and work with any of the supported SQL database systems using the same API. These include Microsoft SQL Server, MySQL, PostgreSQL, SQLite, and others.

Zend_Feed provides functionality for consuming RSS and Atom feeds. It provides a natural syntax for accessing elements of feeds, feed attributes, and entry attributes. Zend_Feed also has extensive support for modifying feed and entry structure with the same natural syntax, and turning the result back into XML. In the future, this modification support could provide support for the Atom Publishing Protocol.

Zend_Filter provides a library of static methods for filtering data. For input filtering, you should use Section 9.2, “Zend_Filter_Input” instead, because it provides a framework for filtering input using the methods provided by this class.

In an earlier article "Gluing Ajax with the Zend Framework" I'm using a doclet called @ajaxaction to mark actions that are handling Ajax requests. If using the Prototype, jQuery or mootools libary, these requests differ from pure HTTP request by having a currently non-standard "X-Requested-With = XMLHttpRequest" header and their response mostly doesn't get rendered via a view. Unless you might use AXAH(Asychronous XHTML and HTTP) where the server might respond with snippets of XHTML to insert into the targeted DOM area.

Google Data APIs provide programmatic interface to some of Google's online services. Client applications submit queries and data via HTTP, and retrieve results. The Zend_Gdata component is a PHP 5 interface for accessing Google Data from PHP.