yii2 - PHP 中的 new static($user) 有何作用,如何理解
如何理解PHP中的 new static()
的用法
在yii2的用户登录处理模型/model/User.php
看到了这一段:
<code>php</code><code><?php namespace app\models; class User extends \yii\base\Object implements \yii\web\IdentityInterface { public $id; public $username; public $password; public $authKey; public $accessToken; private static $users = [ '100' => [ 'id' => '100', 'username' => 'admin', 'password' => 'admin', 'authKey' => 'test100key', 'accessToken' => '100-token', ], '101' => [ 'id' => '101', 'username' => 'demo', 'password' => 'demo', 'authKey' => 'test101key', 'accessToken' => '101-token', ], ]; /** * @inheritdoc */ public static function findIdentity($id) { return isset(self::$users[$id]) ? new static(self::$users[$id]) : null; } /** * @inheritdoc */ public static function findIdentityByAccessToken($token, $type = null) { foreach (self::$users as $user) { if ($user['accessToken'] === $token) { return new static($user); } } return null; } /** * Finds user by username * * @param string $username * @return static|null */ public static function findByUsername($username) { foreach (self::$users as $user) { if (strcasecmp($user['username'], $username) === 0) { return new static($user); } } return null; } /** * @inheritdoc */ public function getId() { return $this->id; } /** * @inheritdoc */ public function getAuthKey() { return $this->authKey; } /** * @inheritdoc */ public function validateAuthKey($authKey) { return $this->authKey === $authKey; } /** * Validates password * * @param string $password password to validate * @return boolean if password provided is valid for current user */ public function validatePassword($password) { return $this->password === $password; } } </code>
return $user ? new static($user) : null
,如果 self::$sers[$id]
里面没有 User
类定义的这些属性,返回就会报错,为什么会这样。如何理解
回复内容:
如何理解PHP中的 new static()
的用法
在yii2的用户登录处理模型/model/User.php
看到了这一段:
<code>php</code><code><?php namespace app\models; class User extends \yii\base\Object implements \yii\web\IdentityInterface { public $id; public $username; public $password; public $authKey; public $accessToken; private static $users = [ '100' => [ 'id' => '100', 'username' => 'admin', 'password' => 'admin', 'authKey' => 'test100key', 'accessToken' => '100-token', ], '101' => [ 'id' => '101', 'username' => 'demo', 'password' => 'demo', 'authKey' => 'test101key', 'accessToken' => '101-token', ], ]; /** * @inheritdoc */ public static function findIdentity($id) { return isset(self::$users[$id]) ? new static(self::$users[$id]) : null; } /** * @inheritdoc */ public static function findIdentityByAccessToken($token, $type = null) { foreach (self::$users as $user) { if ($user['accessToken'] === $token) { return new static($user); } } return null; } /** * Finds user by username * * @param string $username * @return static|null */ public static function findByUsername($username) { foreach (self::$users as $user) { if (strcasecmp($user['username'], $username) === 0) { return new static($user); } } return null; } /** * @inheritdoc */ public function getId() { return $this->id; } /** * @inheritdoc */ public function getAuthKey() { return $this->authKey; } /** * @inheritdoc */ public function validateAuthKey($authKey) { return $this->authKey === $authKey; } /** * Validates password * * @param string $password password to validate * @return boolean if password provided is valid for current user */ public function validatePassword($password) { return $this->password === $password; } } </code>
return $user ? new static($user) : null
,如果 self::$sers[$id]
里面没有 User
类定义的这些属性,返回就会报错,为什么会这样。如何理解
http://stackoverflow.com/questions/5197300/new-self-vs-new-static
这里有说明
new static : 创建入口对象的新对象。
new self : 创建拥有此方法对象的新对象。
new parent : 创建拥有此方法对象父类的新对象。

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