ZF Zend Framework

Zend_Auth is used for authenticating users; authentication is the act of verifying that the provided credentials are valid - that somebody is who they say they are. For more information on Zend Framework's authentication implementation, visit the Zend_Auth documentation.

Zend_Acl provides an Access Control List (ACL) implementation. ACLs are used to authorize somebody to do something - typically to or with a given resource. Zend_Acl allows you to verify that a role has the rights to a particular resource. For more information on Zend_Acl, read the Zend_Acl documentation.

There are lots of ways to contribute to Zend Framework. Many major features are contributed to ZF through our proposal process. Many code contributors also commit bug fixes and tests. Another valuable form of contribution is manual translation. Contributors may also invest their time in updating the wiki or adding, commenting on, and voting on issues in our issue tracker. No matter how you plan to contribute, the best place to get started is our contributor guide.

Actually, by default, if your expression includes parentheses, Zend_Db_Select will cast the statement appopriately. However, if it does not, or you are having problems, you can use Zend_Db_Expr to explicitly create the expression:

You're probably looking for decorators. All forms and form elements in Zend_Form use decorators to render their output.

This can easily be done using decorators. For instance using the Description decorator. It is important to note though that you will need to turn off escaping for the output of the decorator:

Now, you can use the following to add extra HTML to the element:

The file element needs a special file decorator. It is added per default by the file element. But when you set your own decorators you deleted the default ones. See this example:

But you have to use the file decorator instead of the ViewHelper for the file element. So you should use it like this:

Zend Framework was built to use all of the advanced object oriented features of PHP 5. Since PHP 4 is not fully forwards compatible with PHP 5, the Zend Framework community was faced with the decision of committing to support PHP 4 or leveraging existing and future enhancements in PHP 5 from the outset. We felt the overall value proposition was tipped in favor of PHP 5 feature, performance, and security enhancements. On top of that, PHP 4 is officially unsupported by the PHP community as of 2008-01-01, and no critical security updates will be published after 2008-08-08.

Unlike the view and the controller components, the model component can vary dramatically in responsibilities and data store from one MVC application to the next. The ZF community has not defined a model interface, class, or other formalism simply because we wanted to avoid introducing limitations without significant added value. With the introduction of Zend_Form in ZF 1.5, there is potential added value in form-model interoperability. We will evaluate proposals for models which facilitate this interoperability while supporting all data backends for future inclusion in the standard library.

Both. Zend Framework provides all the components required for most web applications in a single distribution. But Zend Framework components are also loosely coupled, making it easier to use just a few components to provide functionality to a web application- even alongside other frameworks! With this use-at-will architecture we are implementing features commonly found in more monolithic frameworks. In fact, we are currently working on a tooling component that will make it simpler to build applications using ZF components, yet will not sacrifice the use-at-will nature of existing ZF components. In fact, the tooling component itself can be used alone.

A variety of components are are translation aware (i.e., accept Zend_Translate objects), including:

• Zend_View_Helper_Translate
• Zend_Validate_*
• Zend_Form

To have them all use the same Zend_Translate instance, simply place it in the registry with the key "Zend_Translate":

With ZF 1.7 an application wide locale is supported. You can do the following in your bootstrap file:

From now on, all locale aware components will use your locale object stored in the registry as long as you don't give another one manually.

When using own formats in your code you could come to a situation where you get for example 29.12.2009, but you expected to get 29.12.2008.

There is one year difference: 2009 instead of 2008. You should use the lower cased year constant. See this example:

Note the lower cased "y" which makes the difference and outputs the real year.

Unlike the view and the controller components, the model component can vary dramatically in responsibilities and data store from one MVC application to the next. The ZF community has not defined a model interface, class, or other formalism simply because we wanted to avoid introducing limitations without significant added value. With the introduction of Zend_Form in ZF 1.5, there is potential added value in form-model interoperability. We will evaluate proposals for models which facilitate this interoperability while supporting all data backends for future inclusion in the standard library.

By default, ZF uses an action helper called the ViewRenderer. This action helper instantiates and stores a Zend_View object which is injected into various other objects. To get the ViewRenderer, pull it from the Action Helper broker:

The view object is stored in the ViewRenderer's view property:

However, if you're grabbing the view early in the dispatch process- before an action is actually dispatched, for example- then you may need to initialize the view first:

The view can also be obtained via the layout object. If you are using and have already initialized Zend_Layout, you can get at the view object much more succinctly:

This actually proxies to the ViewRenderer, and does all of the above steps for you.

ContextSwitch makes the assumptions that (a) you are not calling _forward() and (b) that your application code will not throw an exception. If you see the above error, your code is throwing an exception - but the context is still in play, and the ViewRenderer is simply trying to load a view script for the current context from the ErrorController.

The easiest way to fix the situation is to have the ErrorController::errorAction() redefine the view script suffix, as follows:

Apache by default disallows urlencoded slashes (i.e., "%2F") in URL path parts or the query string. This feature can be disabled by enabling the "AllowEncodedSlashes" directive:

However, this directive must be set at either a server-wide (httpd.conf) or virtual-host level.

For more information, read the AllowEncodedSlashes documentation.

Lucene is a high-performance, full-featured text search engine that utilizes an open, binary format for storing search indexes and a standardized query format for querying against the indexes. Lucene was originally written in Java as part of the Apache project; Zend_Search_Lucene is a PHP implementation that provides full binary compatibility with Java Lucene.

Yes! We regularly use Luke to inspect our Zend_Search_Lucene-generated indexes, and the Zend Framework site itself accesses indexes created by our Java developer tools to provide site-wide search capabilities.

Zend Framework has been designed to solve the most common problems in web application development. Web services are a big part of today's web development environment. So much so that many of our users consume our web service clients for services such as Amazon ECS, Akismet, and ReCaptcha before adopting more infrastructure-oriented components such as Zend_Registry and Zend_Log. Because web services are so important in today's web applications, we have chosen to make them 'first-class citizens' in ZF.

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