Prendre un Snippet

class Multiton
{
  private $instances = array();
 
  public function getInstance($var1, $var2, $var3)
  {
    $uid = md5((string)$var1.(string)$var2.(string)$var3);
    if (!isset(self::$instances[$uid])) 
    { 
      self::$instances[$uid] = new Multiton($var1, $var2, $var3);
    }
    return self::$instances[$uid];
  }
 
}

<?php
interface 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 );
?>

<?php
interface 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 );
?>

<?php
interface 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" );
?>

<?php
interface 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" );
?>

Instance unique d'un objet.

<?php 
class Singleton 
{ 
    private static $_instance ; 
 
    private function __construct() { }
 
    public static function GetInstance() 
    { 
        if (!isset(self::$_instance)) 
        { 
            self::$_instance = new Singleton() ; 
        } 
        return self::$_instance; 
    }
}
?>