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vendor/yiisoft/yii2/base/ViewRenderer.php

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+<?php
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\base;
+
+/**
+ * ViewRenderer is the base class for view renderer classes.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @since 2.0
+ */
+abstract class ViewRenderer extends Component
+{
+    /**
+     * Renders a view file.
+     *
+     * This method is invoked by [[View]] whenever it tries to render a view.
+     * Child classes must implement this method to render the given view file.
+     *
+     * @param View $view the view object used for rendering the file.
+     * @param string $file the view file.
+     * @param array $params the parameters to be passed to the view file.
+     * @return string the rendering result
+     */
+    abstract public function render($view, $file, $params);
+}