Why you should always use PHP interfaces

最新推荐文章于 2025-02-04 20:16:29 发布

原创最新推荐文章于 2025-02-04 20:16:29 发布 · 381 阅读

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#php #function #dao #user #null #class

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本文通过具体示例介绍了如何在PHP中使用接口和代理模式。首先定义了一个用户接口（userInterface），然后通过实现该接口的具体类（user）和代理类（userProxy）展示了如何在延迟加载的情况下验证用户成员资格。

原文地址:http://www.davegardner.me.uk/blog/2010/11/21/why-you-should-always-use-php-interfaces/

在这里只列出文章里面的代码

// our interface interface userInterface { public function isMember(); } // our concrete user class class user implements userInterface { private $paidUntil; public function __construct($paidUntil) { $this->paidUntil = $paidUntil; } public function isMember() { return $paidUntil > time(); } } // our proxy class userProxy implements userInterface { private $dao; private $user; private $userId; public function __construct($dao, $userId) { $this->dao = $dao; // set user to NULL to indicate we haven't loaded yet $this->user = NULL; } public function isMember() { if ($this->user === NULL) { $this->lazyLoad(); } return $this->user->isMember(); } private function lazyLoad() { $this->user = $this->dao->getById($this->userId); } } class inviteList { public function add(userInterface $user) { if (!$user->isMember()) { throw new youMustPayException('You must be a member to get an invite.'); } // do something else } }