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<?php
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interface IObserver
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{
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  function onChanged( $sender, $args );
05
}
06
 
07
interface IObservable
08
{
09
  function addObserver( $observer );
10
}
11
 
12
class UserList implements IObservable
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{
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  private $_observers = array();
15
 
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  public function addCustomer( $name )
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  {
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    foreach( $this->_observers as $obs )
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      $obs->onChanged( $this, $name );
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  }
21
 
22
  public function addObserver( $observer )
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  {
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    $this->_observers []= $observer;
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  }
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}
27
 
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class UserListLogger implements IObserver
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{
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  public function onChanged( $sender, $args )
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  {
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    echo( "'$args' added to user list\n" );
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  }
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}
35
 
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$ul = new UserList();
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$ul->addObserver( new UserListLogger() );
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$ul->addCustomer( "Jack" );
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?>
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