Introduction to Zend Framework

 Learning Zend Framework


 Zend Framework Reference

  •  Zend_Gdata
  •  Zend_Http
  •  Zend_InfoCard
  •  Zend_Json
  •  Zend_Layout
  •  Zend_Ldap
  •  Zend_Loader
  •  Zend_Locale
  •  Zend_Log
  •  Zend_Mail
  •  Zend_Markup
  •  Zend_Measure
  •  Zend_Memory
  •  Zend_Mime
  •  Zend_Navigation
  •  Zend_Oauth
  •  Zend_OpenId
  •  Zend_Paginator
  •  Zend_Pdf
  •  Zend_ProgressBar
  •  Zend_Queue
  •  Zend_Reflection
  •  Zend_Registry
  •  Zend_Rest

  •  Zend_Search_Lucene
  •  Zend_Serializer
  •  Zend_Server
  •  Zend_Service
  •  Zend_Session
  •  Zend_Soap
  •  Zend_Tag
  •  Zend_Test
  •  Zend_Text
  •  Zend_TimeSync
  •  Zend_Tool
  •  Zend_Tool_Framework
  •  Zend_Tool_Project
  •  Zend_Translate
  •  Zend_Uri
  •  Zend_Validate
  •  Zend_Version
  •  Zend_View
  •  Zend_Wildfire
  •  Zend_XmlRpc
  • ZendX_Console_Process_Unix
  • ZendX_JQuery
  • Update 2011-11-16 - Revision 24438 - Version ZF 1.11.x

    77.5. Zend_View_Abstract

    Zend_View_Abstract is the base class on which Zend_View is built; Zend_View itself simply extends it and declares a concrete implementation of the _run() method (which is invoked by render()).

    Many developers find that they want to extend Zend_View_Abstract to add custom functionality, and inevitably run into issues with its design, which includes a number of private members. This document aims to explain the decision behind the design.

    Zend_View is something of an anti-templating engine in that it uses PHP natively for its templating. As a result, all of PHP is available, and view scripts inherit the scope of their calling object.

    It is this latter point that is salient to the design decisions. Internally, Zend_View::_run() does the following:

    protected function _run()

    As such, the view scripts have access to the current object ($this), and any methods or members of that object. Since many operations depend on members with limited visibility, this poses a problem: the view scripts could potentially make calls to such methods or modify critical properties directly. Imagine a script overwriting $_path or $_file inadvertently -- any further calls to render() or view helpers would break!

    Fortunately, PHP 5 has an answer to this with its visibility declarations: private members are not accessible by objects extending a given class. This led to the current design: since Zend_View extends Zend_View_Abstract, view scripts are thus limited to only protected or public methods and members of Zend_View_Abstract -- effectively limiting the actions it can perform, and allowing us to secure critical areas from abuse by view scripts.

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