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copied!<p>Lets understand both the statements</p> <pre><code> $user= User::model()->findByAttributes(array('email'=>$this->username)); </code></pre> <p>Lets first understand <strong>findByAttributes()</strong><br> This is defined in the <strong>CActiveRecord class</strong>, which all database models should extend. In theory, you could create an instance of the class and then use that instance’s method:</p> <pre><code>$model = new Page; $model = $model->findByPk($id); </code></pre> <p>That would work, but it’s a bit verbose, redundant, and illogical. <strong>The alternative is to use a static class instance</strong>. A static class instance is a more advanced OOP concept.<br> Now <strong>User::model()</strong><br><br> If you will look into your User.php you will find a function like</p> <pre><code>public static function model($className=__CLASS__) { return parent::model($className); } </code></pre> <p>So what does <strong>User::model()</strong> does?<br><br> Here model() is a static method and here it represents <strong>model() method of User class</strong> .<br> So basically <strong>User::model()</strong> returns a <strong>User class object.</strong><br> Hence when you execute this statement</p> <pre><code>$user= User::model()->findByAttributes(array('email'=>$this->username)); </code></pre> <p>Then in turn you get a <strong>User class object in the form of $user</strong>.<br><br> And this is the reason that you can access <code>encrypt()</code> method like <code>$user->encrypt()</code></p> <p><strong>Source:-</strong> Larry Ulman's Yii Book</p>

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