пример вверху!

PHP:
interface RowStrategy {
public function execute(array $row);
}

abstract class FieldPrinterStrategy implements RowStrategy {
abstract protected function getFieldName();

public function execute(array $row) {
echo $row[$this->getFieldName()];
}
}

class NamePrinterStrategy extends FieldPrinterStrategy {
protected function getFieldName() {
return 'name';
}
}

class TextPrinterStrategy extends FieldPrinterStrategy {
protected function getFieldName() {
return 'text';
}
}

class AdDao {
public function applyStrategy(RowStrategy $strategy) {
foreach ($this->fetchAll() as $row)
$strategy->execute($row);
}
}

$adDao->applyStrategy(new NamePrinterStrategy);
$adDao->applyStrategy(new TextPrinterStrategy);