PHP依赖注入

来源：互联网发布：java认证培训中心编辑：程序博客网时间：2024/05/18 19:20

$_SESSION['language'] = 'fr';$user_language = $_SESSION['language'];

class SessionStorage{  function __construct($cookieName = 'PHP_SESS_ID')  {    session_name($cookieName);    session_start();  }  function set($key, $value)  {    $_SESSION[$key] = $value;  }  function get($key)  {    return $_SESSION[$key];  }  // ...}

class User{  protected $storage;  function __construct()  {    $this->storage = new SessionStorage();  }  function setLanguage($language)  {    $this->storage->set('language', $language);  }  function getLanguage()  {    return $this->storage->get('language');  }  // ...}

$user = new User();$user->setLanguage('fr');$user_language = $user->getLanguage();

class User{    function __construct()    {        $this->storage = new SessionStorage('SESSION_ID');    }    // ...}

class User{  function __construct()  {    $this->storage = new SessionStorage(STORAGE_SESSION_NAME);  }  // ...}define('STORAGE_SESSION_NAME', 'SESSION_ID');

class User{  function __construct($sessionName)  {    $this->storage = new SessionStorage($sessionName);  }  // ...}$user = new User('SESSION_ID');

class User{  function __construct($storageOptions)  {    $this->storage = new SessionStorage($storageOptions['session_name']);  }  // ...}$user = new User(array('session_name' => 'SESSION_ID'));

class User{  function __construct($storage)  {    $this->storage = $storage;  }  // ...}

$storage = new SessionStorage('SESSION_ID');$user = new User($storage);

实际上依赖注入关键就是把实例当做参数传入构造函数，降低了业务类之间的耦合。

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