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I haven’t had much luck finding a quick reference to the Zend Framework, so I put this short guide together for my own use. Because I’ve just digested the Zend Framework Documentation there are some essential pieces missing (eg Action Controllers), so I’ll be updating this document as I go.

Model-View-Controller

Zend_Controller

MVC Controller. Implements a Front Controller pattern, in which all requests are intercepted by the front controller and dispatched to individual Action Controllers based on the URL requested.

Zend_View

A class for working with the “view” portion of the model-view-controller pattern.

Zend_Layout

Implements a classic Two Step View pattern, allowing developers to wrap application content within another view, usually representing the site template.

General-Purpose Components

Zend_Acl

Lightweight and flexible access control list (ACL) functionality and privileges management. An application may utilize such functionality to control access to certain protected objects by other requesting objects.

Zend_Auth

An API for authentication. Includes concrete authentication adapters for common use case scenarios.

Zend_Cache

A generic data cache.

Zend_Db

SQL database interface.

Zend_Log

General purpose logging with multiple backends and message filtering.

Zend_Registry

A container for storing objects and values in the application space. An alternative to globals.

Zend_Search_Lucene

A general purpose text search engine written entirely in PHP 5.

Zend_Session

Manages and preserves session data across multiple page requests by the same client.

Data Parsing & Validation, File Formats

Zend_Config

Parse .ini files.

Zend_Console_Getopt

Parse command-line options and arguments.

Zend_Validate

Common data validators and a simple chaining mechanism.

Zend_Filter

Common data filters and a simple filter chaining mechanism.

Zend_Filter_Input

A declarative interface to associate multiple filters and validators, apply them to collections of data and to retrieve input values post-processing.

Zend_OpenId

A simple API for building OpenID-enabled sites and identity providers.

Zend_Uri

Manipulates and validates Uniform Resource Identifiers (URIs).

Zend_Form

Simple form creation and validation.

Zend_Mime

Handle multipart MIME messages.

Zend_Json

PHP -> JSON and JSON -> PHP

Zend_Pdf

PDF manipulation engine written entirely in PHP 5.

Zend_Measure

Unit conversion, addition, subtraction and comparison. Numerous units of measurement are supported.

Zend_Infocard

Implements relying-party support for Information Cards. Infomation Cards are used for identity management on the internet and authentication of users to web sites (called relying parties).

External Data Sources & Services

Zend_Http

Interface for performing HTTP requests.

Zend_Mail

Send both text and MIME-compliant multipart e-mail messages.

Zend_Rest

Implement server and client RESTful web service interfaces.

Zend_Feed

Consume RSS and Atom feeds.

Zend_XmlRpc

Provides support for both consuming remote XML-RPC services and building new XML-RPC servers.

Zend_Gdata

Programmatic interfaces to some of Google’s online services.

Zend_Service_Yahoo

Programmatic interfaces to some of Yahoo’s online services.

Zend_Service_Akismet

Spam filtering via the Akismet API

Zend_Service_Amazon

Simple Amazon web services
client.

Zend_Service_Audioscrobbler

Simple API for using the Audioscrobbler REST Web
Service.

Zend_Service_Delicious

Simple API for using del.icio.us‘ XML and JSON web services.

Zend_Service_Flickr

Simple API for using the Flickr REST Web Service.

Zend_Service_Simpy

A lightweight wrapper using the Simpy social bookmarking service REST Web Service.

Zend_Service_StrikeIron

Access commercial web services via StrikeIron’s standard SOAP or REST APIs

Zend_Service_Technorati

An easy, intuitive and object-oriented interface for using the Technorati API.

Dates & Times, Internationalization & Localization

Zend_Date

Manipulate dates and times.

Zend_Translate

Supports multilingual applications

Zend_Currency

I18N currency support. Money representation and formatting.

Zend_Locale

L10N Support

Zend Framework-Specific

Zend_Debug

Zend_Debug::dump() returns (or displays) information about an expression.

Zend_Version

The class constant Zend_Version::VERSION contains a string that identifies the current version number of Zend Framework.

Zend_Exception

Base class for Exceptions thrown by the Zend Framework.

Zend_Server_Reflection

Provides a standard mechanism for performing function and class introspection for use with Zend_Server_* classes. Extends PHP 5’s Reflection API.

Zend_Loader

Methods to load files dynamically.

Zend_Memory

Manage data in a limited-memory environment. [It’s basically an application-level memory-paging mechanism, backed by file/sqlite/memcached/etc.]