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作者:Jack Herrington 来源:IBM 2007年10月21日
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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 ); ?> |
% php strategy.php Array ( [0] => Jack [1] => Lori [2] => Megan ) Array ( [0] => Andy [1] => Megan ) % |
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