控制反转原则，它和依赖注入有什么联系

class Person
{
   private $name = '';
   private $age = 0;

   public function __construct(string $name, int $age)
   {
       $this->name = $name;
       $this->age = $age;
   }

   public function eat ()
   {
       echo '吃东西' . PHP_EOL;
   }

   public function drink ()
   {
       echo '喝水' . PHP_EOL;
   }

   public function sleep ()
   {
       echo '睡觉' . PHP_EOL;
   }

   public function wakeup ()
   {
       echo '起床' . PHP_EOL;
   }

   public function drive ()
   {
       echo '开车' . PHP_EOL;
   }

   public function wash ()
   {
       echo '洗漱' . PHP_EOL;
   }
}

$person = new Person('小明', 24);
$person->wakeup();
$person->wash();
$person->eat();
echo '带上车钥匙、手机、电脑' .PHP_EOL;
$person->drive();

public function work (callable $bring)
{
    $this->wakeup();
    $this->wash();
    $this->eat();
    $bring();
    $this->drive();
}

$person = new Person('小黄', 29);
$person->work(function ()
{
    echo '带上手机、车钥匙、文件' . PHP_EOL;
});

interface Log
{
   function write (string $msg);
}

class TextLog implements Log
{
   public function __construct($dirname, $txtname)
   {
       $this->makeDir($dirname);
       $this->mkTxt($txtname);
   }

   private function makeDir (string $dirName) :void
   {
       // do something
   }

   private function mkTxt (string $txtName) :void
   {
       // do something
   }

   public function write (string $msg)
   {
       // do something
   }
}

class RedisLog implements Log
{
   private $redis = null;
   private $key = '';

   public function __construct(string $key)
   {
       $this->redis = '...'; // 获取redis实例
       $this->key = $key;
       // ...
   }

   public function write (string $msg)
   {
       // do something
   }
}

class App
{
   public function run ()
   {
       // do something

       // 记录日志
       (new RedisLog('log'))->write('框架运行信息记录');
   }
}

class App
{
   private $logHandle = null;

   public function __construct(Log $log)
   {
       $this->logHandle = $log;
   }

   public function run ()
   {
       // do something

       // 记录日志
       $this->logHandle->write('框架运行信息记录');
   }
}