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HomeBackend DevelopmentPHP TutorialZend Framework自定义Helper类相关注意事项总结_php实例

本文讲述了Zend Framework自定义Helper类相关注意事项。分享给大家供大家参考,具体如下:

编写自定义的Helper类

编写自定义的Helper类很容易,只要遵循以下几个原则即可:

① 类名必须是 Zend_View_Helper_*,*是helper的名称。例如,你在写一个名为“specialPurpose”的类,类名将至少是"SpecialPurpose",另外你还应该给类名加上前缀,建议将“View_Helper”作为前缀的一部份:“My_View_Helper_SpecialPurpose”。(注意大小写)你将需要将前缀(不包含下划线)传递给addHelperPath() 或 setHelperPath()。
② 类中必须有一个public的方法,该方法名与helper类名相同。这个方法将在你的模板调用"$this->specialPurpose()"时执行。在我们的“specialPurpose”例子中,相应的方法声明可以是 “public function specialPurpose()”。
③ 一般来说,Helper类不应该echo或print或有其它形式的输出。它只需要返回值就可以了。返回的数据应当被转义。
④ 类文件的命名应该是helper方法的名称,比如在"specialPurpose"例子中,文件要存为“SpecialPurpose.php”。

把helper类的文件放在你的helper路径下, Zend_View就会自动加载,实例化,持久化,并执行。

三点类文件名称,类名称,类中helper方法,保持某种程度上的一致。

贴代码:

两个helper,看清楚了,他们的不同啊。。。。。

version   zf 1.10

Bootstrap.php

class Bootstrap extends Zend_Application_Bootstrap_Bootstrap {
  protected function _initDoctype() {
    $this->bootstrap ( 'view' );
    $view = $this->getResource ( 'view' );
    $view->doctype ( 'XHTML1_STRICT' );
  }
  protected function _initView() {
    $view = new Zend_View ();
    $view->setEncoding ( 'UTF-8' );
    $view->doctype ( 'XHTML1_STRICT' );
    $view->addHelperPath('../application/views/helpers', 'My_View_Helper');
    $viewRenderer = new Zend_Controller_Action_Helper_ViewRenderer();
    Zend_Controller_Action_HelperBroker::addHelper($viewRenderer);
    $viewRenderer->setView($view);
    return $view;
  }
}

application/views/helpers

Img.php:

class Zend_View_Helper_Img extends Zend_View_Helper_Abstract
{
  public function img()
  {
    return "this is a img";
  }
}

TestHelper.php:

class My_View_Helper_TestHelper extends Zend_View_Helper_Abstract
{
  public function testHelper()
  {
    return "this is a TestHelper";
  }
}

action中使用:

<&#63;php echo $this->doctype() &#63;>
<&#63;php echo $this->img() &#63;>
<&#63;php echo $this->testHelper() &#63;>

附加内容,在initView中添加addHelperPath,可以改成采用加载application。ini文件配置项的方式把路径进行配置。如下

class Bootstrap extends Zend_Application_Bootstrap_Bootstrap {
 protected function _initDoctype() {
 $this->bootstrap ( 'view' );
 $view = $this->getResource ( 'view' );
 $view->doctype ( 'XHTML1_STRICT' );
 }
 protected function _initView() {
 $view = new Zend_View ();
 $view->setEncoding ( 'UTF-8' );
 $view->doctype ( 'XHTML1_STRICT' );
 $options = $this->getOptions ();
 $viewOptions = $options ['resources']['view']['helperPath'];
 if (is_array ($viewOptions)) {
  foreach($viewOptions as $helperName =>$path)
  {
  $view->addHelperPath ( $path, $helperName );
  }
 }
 $viewRenderer = new Zend_Controller_Action_Helper_ViewRenderer ();
 Zend_Controller_Action_HelperBroker::addHelper ( $viewRenderer );
 $viewRenderer->setView ( $view );
 return $view;
 }
}

[production]
phpSettings.display_startup_errors = 1
phpSettings.display_errors = 1
includePaths.library = APPLICATION_PATH "/../library"
bootstrap.path = APPLICATION_PATH "/Bootstrap.php"
bootstrap.class = "Bootstrap"
appnamespace = "Application"
resources.view[] =
resources.view.helperPath.My_View_Helper = "../application/views/helpers"
resources.frontController.controllerDirectory = APPLICATION_PATH "/controllers"
resources.frontController.params.displayExceptions = 1
[staging : production]
[testing : production]
phpSettings.display_startup_errors = 1
phpSettings.display_errors = 1
[development : production]
phpSettings.display_startup_errors = 1
phpSettings.display_errors = 1
resources.frontController.params.displayExceptions = 1

更多关于zend相关内容感兴趣的读者可查看本站专题:《Zend FrameWork框架入门教程》、《php优秀开发框架总结》、《Yii框架入门及常用技巧总结》、《ThinkPHP入门教程》、《php面向对象程序设计入门教程》、《php+mysql数据库操作入门教程》及《php常见数据库操作技巧汇总》

希望本文所述对大家PHP程序设计有所帮助。

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