5 adet PHP tasarım kalıbı (kodlarıyla)
 

Listing 1. Factory1.php
<?phpinterface IUser{ function getName();}class User implements IUser{ public function __construct( $id ) { } public function getName() { return "Jack"; }}class UserFactory{ public static function Create( $id ) { return new User( $id ); }}$uo = UserFactory::Create( 1 );echo( $uo->getName()."\n" );?>

Figure 1. The factory class and its related IUser interface and user class
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% php factory1.php Jack%

Listing 2. Factory2.php
<?phpinterface IUser{ function getName();}class User implements IUser{ public static function Load( $id ) { return new User( $id ); } public static function Create( ) { return new User( null ); } public function __construct( $id ) { } public function getName() { return "Jack"; }}$uo = User::Load( 1 );echo( $uo->getName()."\n" );?>

Figure 2. The IUser interface and the user class with factory methods
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Running the script on the command line yields the same result as the code in Listing 1, as shown here:
% php factory2.php Jack%

Listing 3. Singleton.php
<?phprequire_once("DB.php");class DatabaseConnection{ public static function get() { static $db = null; if ( $db == null ) $db = new DatabaseConnection(); return $db; } private $_handle = null; private function __construct() { $dsn = 'mysql://root:password@localhost/photos'; $this->_handle =& DB::Connect( $dsn, array() ); } public function handle() { return $this->_handle; }}print( "Handle = ".DatabaseConnection::get()->handle()."\n" );print( "Handle = ".DatabaseConnection::get()->handle()."\n" );?>

Figure 3. The database connection singleton
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% php singleton.php Handle = Object id #3Handle = Object id #3%

Listing 4. Observer.php
<?phpinterface IObserver{ function onChanged( $sender, $args );}interface IObservable{ function addObserver( $observer );}class UserList implements IObservable{ private $_observers = array(); public function addCustomer( $name ) { foreach( $this->_observers as $obs ) $obs->onChanged( $this, $name ); } public function addObserver( $observer ) { $this->_observers []= $observer; }}class UserListLogger implements IObserver{ public function onChanged( $sender, $args ) { echo( "'$args' added to user list\n" ); }}$ul = new UserList();$ul->addObserver( new UserListLogger() );$ul->addCustomer( "Jack" );?>

Figure 4. The observable user list and the user list event logger
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If you run this on the command line, you see this output:
% php observer.php 'Jack' added to user list%

Listing 5. Chain.php
<?phpinterface ICommand{ function onCommand( $name, $args );}class CommandChain{ private $_commands = array(); public function addCommand( $cmd ) { $this->_commands []= $cmd; } public function runCommand( $name, $args ) { foreach( $this->_commands as $cmd ) { if ( $cmd->onCommand( $name, $args ) ) return; } }}class UserCommand implements ICommand{ public function onCommand( $name, $args ) { if ( $name != 'addUser' ) return false; echo( "UserCommand handling 'addUser'\n" ); return true; }}class MailCommand implements ICommand{ public function onCommand( $name, $args ) { if ( $name != 'mail' ) return false; echo( "MailCommand handling 'mail'\n" ); return true; }}$cc = new CommandChain();$cc->addCommand( new UserCommand() );$cc->addCommand( new MailCommand() );$cc->runCommand( 'addUser', null );$cc->runCommand( 'mail', null );?>

Figure 5. The command chain and its related commands
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If you run the script, which contains some test code, you see the following output:
% php chain.php UserCommand handling 'addUser'MailCommand handling 'mail'%

Listing 6. Strategy.php
<?phpinterface IStrategy{ function filter( $record );}class FindAfterStrategy implements IStrategy{ private $_name; public function __construct( $name ) { $this->_name = $name; } public function filter( $record ) { return strcmp( $this->_name, $record ) <= 0; }}class RandomStrategy implements IStrategy{ public function filter( $record ) { return rand( 0, 1 ) >= 0.5; }}class UserList{ private $_list = array(); public function __construct( $names ) { if ( $names != null ) { foreach( $names as $name ) { $this->_list []= $name; } } } public function add( $name ) { $this->_list []= $name; } public function find( $filter ) { $recs = array(); foreach( $this->_list as $user ) { if ( $filter->filter( $user ) ) $recs []= $user; } return $recs; }}$ul = new UserList( array( "Andy", "Jack", "Lori", "Megan" ) );$f1 = $ul->find( new FindAfterStrategy( "J" ) );print_r( $f1 );$f2 = $ul->find( new RandomStrategy() );print_r( $f2 );?>
The UML for this code is shown in Figure 6.

Figure 6. The user list and the strategies for selecting users
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% php strategy.php Array( [0] => Jack [1] => Lori [2] => Megan)Array( [0] => Andy [1] => Megan)%