Zend Framework Smarty extension implementation method

<?php

/**

* Zend_View_Interface

*/

require_once 'Zend/View/Interface.php';

/**

* Smarty

*/

require_once("smarty/Smarty.class.php");

/**

* 创建Smarty视图

*/

class Zend_View_Smarty implements Zend_View_Interface

{

  /**

   * Smarty object

   * @var Smarty

   */

  protected $_smarty;

  /**

   * Constructor

   *

   * @param string $tmplPath

   * @param array $extraParams

   * @return void

   */

  public function __construct($tmplPath = null, $extraParams = array())

  {

    $this->_smarty = new Smarty;

    if (null !== $tmplPath) {

      $this->setScriptPath($tmplPath);

    }

    foreach ($extraParams as $key => $value) {

      $this->_smarty->$key = $value;

    }

  }

  /**

   * Return the template engine object 

   *

   * @return Smarty

   */

  public function getEngine()

  {

    return $this->_smarty;

  }

  /**

   * Set the path to the templates

   *

   * @param string $path The directory to set as the path.

   * @return void

   */

  public function setScriptPath($path)

  {

    if (is_readable($path)) {

      $this->_smarty->template_dir = $path;

      return;

    }

    throw new Exception('Invalid path provided');

  }

  /**

  * set smarty缓存

  * @author lengfeng

  */

  public function setCompilePath($path){

    if (is_readable($path)) {

      $this->_smarty->compile_dir = $path;

      return;

    }

    throw new Exception('Invalid path provided');   

  }

  /**

  * set smarty 编译后文档

  * @author lengfeng

  */

  public function setCachePath($path){

    if (is_readable($path)) {

      $this->_smarty->cache_dir = $path;

      return;

    }

    throw new Exception('Invalid path provided');   

  }

  /**

   * Retrieve the current template directory

   *

   * @return string

   */

  public function getScriptPaths()

  {

    return array($this->_smarty->template_dir);

  }

  /**

   * Alias for setScriptPath

   *

   * @param string $path

   * @param string $prefix Unused

   * @return void

   */

  public function setBasePath($path, $prefix = 'Zend_View')

  {

    return $this->setScriptPath($path);

  }

  /**

   * Alias for setScriptPath

   *

   * @param string $path

   * @param string $prefix Unused

   * @return void

   */

  public function addBasePath($path, $prefix = 'Zend_View')

  {

    return $this->setScriptPath($path);

  }

  /**

   * Assign a variable to the template

   *

   * @param string $key The variable name.

   * @param mixed $val The variable value.

   * @return void

   */

  public function __set($key, $val)

  {

    $this->_smarty->assign($key, $val);

  }

  /**

   * Retrieve an assigned variable

   *

   * @param string $key The variable name.

   * @return mixed The variable value.

   */

  public function __get($key)

  {

    return $this->_smarty->get_template_vars($key);

  }

  /**

   * Allows testing with empty() and isset() to work

   *

   * @param string $key

   * @return boolean

   */

  public function __isset($key)

  {

     return (null !== $this->_smarty->get_template_vars($key));

  }

  /**

   * Allows unset() on object properties to work

   *

   * @param string $key

   * @return void

   */

  public function __unset($key)

  {

    $this->_smarty->clear_assign($key);

  }

  /**

   * Assign variables to the template

   *

   * Allows setting a specific key to the specified value, OR passing an array

   * of key => value pairs to set en masse.

   *

   * @see __set()

   * @param string|array $spec The assignment strategy to use (key or array of key

   * => value pairs)

   * @param mixed $value (Optional) If assigning a named variable, use this

   * as the value.

   * @return void

   */

  public function assign($spec, $value = null)

  {

    if (is_array($spec)) {

      $this->_smarty->assign($spec);

      return;

    }

    $this->_smarty->assign($spec, $value);

  }

  /**

   * Clear all assigned variables

   *

   * Clears all variables assigned to Zend_View either via {@link assign()} or

   * property overloading ({@link __get()}/{@link __set()}).

   *

   * @return void

   */

  public function clearVars()

  {

    $this->_smarty->clear_all_assign();

  }

  /**

   * Processes a template and returns the output.

   *

   * @param string $name The template to process.

   * @return string The output.

   */

  public function render($name)

  {

    return $this->_smarty->fetch($name);

  }

  /**

   * 设置是否生成缓存

   * 如果没有参数,默认为true

   */

  public function setCache($bool){

     if (isset($bool)) {

      $this->_smarty->caching = $bool;

      return;

    }

  }

}

dir.compile    = ../app/compile

dir.cache    = ../app/cache

/**

* 初始化smarty视图

*

*/

private function _initSmartyView()

{

    $view = new Zend_View_Smarty();

    $view->setBasePath($this->_pathConfig->dir->viewBase);

    $view->setScriptPath($this->_pathConfig->dir->viewBase."/scripts");

    $view->setCompilePath($this->_pathConfig->dir->compile);

    $view->setCachePath($this->_pathConfig->dir->cache);

    $smarty=$view->getEngine();

    $smarty->caching=false;

    $smarty->debugging = true;

    $smarty->compile_check = true;   

    $smarty->left_delimiter = "<{"; //定义标示符

    $smarty->right_delimiter = "}>";

    $registry = Zend_Registry::getInstance();

    $registry->set('smartyview',$smarty); //smarty对象

    $registry->set('sview',$view);         

}

$this->_initSmartyView();

$view = Zend_Registry::getInstance()->get("smartyview");

//注意这是smarty对象，使用smarty的那些语法，比如 $view->assign("user","root");

$view = Zend_Registry::getInstance()->get("sview");

//这是zf的view对象，按zf中的那些方法用，不用改变。

//按这样，你如果要将以前写的代码改为用smaty，后台不用变了，只需要将视图文件改变就行了