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<?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 );
?>