模板模式

<?php
abstract class Phone{
    final public function run(){
        $this->powerOn();
        $this->showLogo();
        $this->callUp();
    }
    protected function powerOn(){
        echo '开机'.'<br>';
    }
    abstract protected function showLogo();
    protected function callUp(){
        echo '打电话'.'<br>';
    }
}

class XiaoMi extends Phone{
    protected function showLogo()
    {
        // TODO: Implement showLogo() method.
        echo '小米'.'<br>';
    }
}

class Index{
    public function run(){
        $xiaomi=new XiaoMi();
        $xiaomi->run();
    }
}

$client=new Index();
$client->run();