Strategy(策略模式)

<?php
 
interface OutputInterface {
    public function load();
}
 
class SerializedArrayOutput implements OutputInterface {
    public function load() {
        return serialize($arrayOfData);
    }
}
 
class JsonStringOutput implements OutputInterface {
    public function load() {
        return json_encode($arrayOfData);
    }
}
 
class ArrayOutput implements OutputInterface {
    public function load() {
        return $arrayOfData;
    }
}