yii2-bootstrap/framework/base/View.php

<?php
/**
 * View class file.
 *
 * @link http://www.yiiframework.com/
 * @copyright Copyright &copy; 2008-2012 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\base;

use yii\util\FileHelper;

/**
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @since 2.0
 */
class View extends Component
{
	public $file;
	public $name;
	/**
	 * @var string|array
	 */
	public $basePath;
	public $owner;
	public $locale;

	public function render($_params_ = array())
	{
		$this->resolveViewFile();
		extract($_params_, EXTR_OVERWRITE);
		ob_start();
		ob_implicit_flush(false);
		require($this->file);
		return ob_get_clean();
	}

	public function resolveViewFile()
	{
		if ($this->file !== null) {
			return $this->file;
		}
		if ($this->name === null || $this->basePath) {

		}

		if(empty($viewName))
			return false;

		if($moduleViewPath===null)
			$moduleViewPath=$basePath;

		if(($renderer=Yii::app()->getViewRenderer())!==null)
			$extension=$renderer->fileExtension;
		else
			$extension='.php';
		if($viewName[0]==='/')
		{
			if(strncmp($viewName,'//',2)===0)
				$viewFile=$basePath.$viewName;
			else
				$viewFile=$moduleViewPath.$viewName;
		}
		else if(strpos($viewName,'.'))
			$viewFile=Yii::getPathOfAlias($viewName);
		else
			$viewFile=$viewPath.DIRECTORY_SEPARATOR.$viewName;

		if(is_file($viewFile.$extension))
			return Yii::app()->findLocalizedFile($viewFile.$extension);
		else if($extension!=='.php' && is_file($viewFile.'.php'))
			return Yii::app()->findLocalizedFile($viewFile.'.php');
		else
			return false;

	}
}