Zend Framework Tutorial, ZendCon 2009

Zend Framework Tutorial Matthew Weier O'Phinney Project Lead Zend Framework ZendCon 2009 19 October 2009

About me:

ZF Contributor since January 2006
Assigned to the ZF team in July 2007
Promoted to Software Architect in April 2008
Project Lead since April 2009

What we'll cover

What is Zend Framework?
Getting and Installing Zend Framework
Utilities and Patterns used throughout ZF
Using ZF's MVC layer: Hands-on demonstration: Pastebin

What is Zend Framework?

Full Stack Framework?

Component Library?

Both.

Getting and Installing Zend Framework

Always found at: http://framework.zend.com /download/latest

Zend Server

CDN Links

Direct Links

Use CLI: % tar xzf ZendFramework-1.9.2-minimal.tar.gz % unzip ZendFramework-1.9.2-minimal.zip
Or use a GUI file manager

Unzip/Untar

Add to your include_path ; UNIX: "/path1:/path2" include_path = ".:/home/matthew/zf/library"

Add to your include_path # Goes in either a <VirtualHost>, # <Directory> or .htaccess: php_value include_path ".:/home/matthew/zf/library"

Add to your include_path <?php set_include_path( implode (PATH_SEPARATOR, array ( '.' , '/home/matthew/zf/library' , get_include_path(), )));

Utilities and Patterns Used throughout Zend Framework

The Autoloader

Class names have a 1:1 relationship with the FileSystem: Zend_Db => Zend/Db.php
The initial class prefix is called the “vendor” or “namespace” prefix: “Zend_”, “ZendX_”
Register either namespace prefixes or actual autoloader callbacks with the ZF autoloader

Rules

Initialize the autoloader require_once 'Zend/Loader/Autoloader.php' ; Zend_Loader_Autoloader::getInstance();

Register namespaces $al = Zend_Loader_Autoloader::getInstance(); $al ->registerNamespace( 'Foo_' ); $al ->registerNamespace( array ( 'Foo_' , 'Bar_' ));

Register other autoloaders $al = Zend_Loader_Autoloader::getInstance(); $al ->registerNamespace( 'Doctrine' ); $al ->pushAutoloader( array ( 'Doctrine' , 'autoload' ), 'Doctrine_' );

Groups of resources with a common vendor prefix/namespace
No 1:1 mapping between class name and filename
Define arbitrary mappings, or use Zend_Application_Module_Autoloader for use with MVC modules

Resource Autoloaders

Create a resource autoloader // Initialize resource autoloader: $loader = new Zend_Loader_Autoloader_Resource( array ( 'namespace' => 'Foo' , 'basePath' => $path , )); // Map $path/forms/*.php to Foo_Form_*: $loader ->addResourceType( 'form' , 'forms' , 'Form' );

Create a module autoloader /* * Maps: * - forms/ -> Foo_Form_* * - models/ -> Foo_Model_* * - models/DbTable -> Foo_Model_DbTable_* * - plugins -> Foo_Plugin_* * - services -> Foo_Service_* * - views/helpers -> Foo_View_Helper_* * - views/filters -> Foo_View_Filter_* */ $loader = new Zend_Application_Module_Autoloader( array ( 'namespace' => 'Foo' , 'basePath' => dirname (__FILE__), ));

Plugins

For those times when 1:1 doesn't work (e.g., application code)
Standard pattern: “all code in this location shares the same class prefix” (aka PrefixPath)
Plugin loader is passed a “short name,” and attempts to resolve it to a known PrefixPath

Rules

Invoking plugins $element ->addValidator( 'NotEmpty' ) ->addValidator( 'Int' ) ->addValidator( 'Even' ) ->addValidator( 'Dozens' ); New, custom validators Custom validator overriding existing validator

Zend_Config

Zend Framework is configurationless, but often your applications are not
Many common configuration formats: XML, INI, PHP
Access to configuration values should not vary between backends
Configuration inheritance is useful

Why Zend_Config?

Sample INI config [production] app.name = "Foo!" db.adapter = "Pdo_Mysql" db.params.username = "foo" db.params.password = "bar" db.params.dbname = "foodb" db.params.host = "127.0.0.1" [testing : production] db.adapter = "Pdo_Sqlite" db.params.dbname = APPLICATION_PATH "/data/test.db"

Sample XML config <?xml version = "1.0" ?> <config> <production> <app><name> Foo! </name></app> <db> <adapter> Pdo_Mysql </adapter> <params username = "foo" password = "bar" dbname = "foodb" host = "127.0.0.1" /> </db> </production> <testing extends = "production" > <db> <adapter> Pdo_Sqlite </adapter> <params dbname = "/data/test.db" /> </db> </testing> </config>

Sample PHP config $production = include 'production.conf.php' ; $config = array ( 'db' => array ( 'adapter' => 'Pdo_Sqlite' , 'params' => array ( 'dbname' => APP_PATH . '/../data/test.db' , ), ) ); $config = $production + $config ; return $config ;

Instantiating a Config object // Load 'testing' section of INI configuration: $config = new Zend_Config_Ini( $fileName , 'testing' ); // Load 'testing' section of XML configuration: $config = new Zend_Config_Xml( $fileName , 'testing' ); // Load 'testing' configuration via PHP array: $config = include 'testing.conf.php' ; $config = new Zend_Config( $config );

Using Config objects // Multiple levels: $appName = $config ->app->name; // Using config object as argument $db = Zend_Db::factory( $config ->db);

Using Zend Framework's MVC Layer

Learn how to create a new ZF MVC project
Learn how to use various MVC components:

Zend_Application, Zend_Controller_Front, Zend_Controller_Action, Zend_Controller_Router, Zend_Db_Table, Zend_View, Action Helpers, View Helpers, Zend_Form, Zend_Layout, etc.

Learn concepts related to separation of concerns

Goals

Create “pastes” with optional expiry; allow listing pastes by username
Single table is ideal for demonstrating simple component interactions
Ask questions as you have them!

The Application: Pastebin

A Paste consists of:

Pastebin Specification code content (required) summary (optional) code_type content type (required, default to plain text) username (optional) timestamp (required; created on commit) expiry (optional) identifier (required; a unique hash)

Each paste will have a unique URL
Pastes may optionally expire, in which case they won't be displayed
Pastes may be listed by username

Pastebin Specification

Step 1: Create the project

In bin/zf.sh or bin/zf.bat of your ZF install (choose based on your OS)
Place bin/ in your path, or create an alias on your path: alias zf=/path/to/bin/zf.sh
Or use pear.zfcampus.org PEAR channel

Locate the zf utility

Create the project # Unix: % zf.sh create project quickstart # DOS/Windows: C:> zf.bat create project quickstart

Add ZF to the project # Symlink: % cd library; ln -s path/to/ZendFramework/library/Zend . # Copy: % cd library; cp -r path/to/ZendFramework/library/Zend .

Create a vhost <VirtualHost *: 80 > ServerAdmin you@atyour.tld DocumentRoot /abs/path/to/quickstart/public ServerName quickstart <Directory /abs/path/to/quickstart/public > DirectoryIndex index.php AllowOverride All Order allow,deny Allow from all </Directory> </VirtualHost>

Add a hosts entry 127.0.0.1 quickstart

Fire up your browser!

Looking under the hood

The bootstrap <?php class Bootstrap extends Zend_Application_Bootstrap_Bootstrap { }

Configuration [production] phpSettings.display_startup_errors = 0 phpSettings.display_errors = 0 includePaths.library = APPLICATION_PATH "/../library" bootstrap.path = APPLICATION_PATH "/Bootstrap.php" bootstrap.class = "Bootstrap" resources.frontController.controllerDirectory = APPLICATION_PATH "/controllers" [staging : production] [testing : production] phpSettings.display_startup_errors = 1 phpSettings.display_errors = 1 [development : production] phpSettings.display_startup_errors = 1 phpSettings.display_errors = 1

Index (default) controller <?php class IndexController extends Zend_Controller_Action { public function init() { /* Initialize action controller here */ } public function indexAction() { // action body } }

Error controller class ErrorController extends Zend_Controller_Action { public function errorAction() { $errors = $this ->_getParam( 'error_handler' ); switch ( $errors ->type) { case 'EXCEPTION_NO_CONTROLLER': case 'EXCEPTION_NO_ACTION': // 404 error -- controller or action not found $this ->getResponse()->setHttpResponseCode( 404 ); $this ->view->message = 'Page not found' ; break ; default: // application error $this ->getResponse()->setHttpResponseCode( 500 ); $this ->view->message = 'Application error' ; break ; } $this ->view->exception = $errors ->exception; $this ->view->request = $errors ->request; } }

Index view (home page) <div id = "welcome" > <h1> Welcome to the <span id = "zf-name" > Zend Framework! </span> </h1> <h3> This is your project's main page </h3>  </div>

Error view <h1>An error occurred</h1> <h2><?php echo $this ->message ?></h2> <?php if ( 'development' == APPLICATION_ENV): ?> <h3>Exception information:</h3> <p> <b>Message:</b> <?php echo $this ->exception->getMessage() ?> </p> <h3>Stack trace:</h3> <pre> <?php echo $this ->exception->getTraceAsString() ?> </pre> <h3>Request Parameters:</h3> <pre> <?php var_dump ( $this ->request->getParams()) ?> </pre> <?php endif ?>

.htaccess file SetEnv APPLICATION_ENV development RewriteEngine On RewriteCond %{REQUEST_FILENAME} -s [OR] RewriteCond %{REQUEST_FILENAME} -l [OR] RewriteCond %{REQUEST_FILENAME} -d RewriteRule ^.*$ - [NC,L] RewriteRule ^.*$ index.php [NC,L]

index.php (environment) <?php // Define path to application directory defined ( 'APPLICATION_PATH' ) || define ( 'APPLICATION_PATH' , realpath ( dirname (__FILE__) . '/../application' )); // Define application environment defined ( 'APPLICATION_ENV' ) || define ( 'APPLICATION_ENV' , ( getenv ( 'APPLICATION_ENV' ) ? getenv ( 'APPLICATION_ENV' ) : 'production' )); // Ensure library/ is on include_path set_include_path( implode (PATH_SEPARATOR, array ( realpath (APPLICATION_PATH . '/../library' ), get_include_path(), )));

index.php (application) /** Zend_Application */ require_once 'Zend/Application.php' ; // Create application, bootstrap, and run $application = new Zend_Application( APPLICATION_ENV, APPLICATION_PATH . '/configs/application.ini' ); $application ->bootstrap() ->run();

Step 2: Create the model

Step 3: Create a form

Step 4: Create a controller

Step 5: Create new routes

Step 6: Create controller actions

Step 7: Create views

Step 8: Create a layout

Step 9: Update the default view

Step 10: Check it out!

Further Steps