YII全局函数使用
由于YII致力于完美的整合第三方库，它并没有定义任何全局函数。yii中的每一个应用都需要全类别和对象范围。
例如，Yii::app()->user;Yii::app()->params['name'];等等。我们可以自行设定全局函数，使得代码看起来更加简洁易用。
require('path/to/globals.php');require('path/to/yii.php');现在我们可以在应用的任何地方使用我们的全局函数，例如可以使用user()代替Yii::app()->user。注：如果你打算发布一个可重用的组件，请不要组件中使用全局函数，在不同的应用配置中，可能导致无法使用。同时，也应注意与第三方库的冲突，可考虑对每个函数前加上自己的前缀，已做区分，例如框架核心均已C为前缀。
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下面是代码包含最常用的一些快捷功能。01/**02?* This is the shortcut to DIRECTORY_SEPARATOR03?*/04defined('DS') or define('DS',DIRECTORY_SEPARATOR);05?06/**07?* This is the shortcut to Yii::app()08?*/09function app()10{11????return Yii::app();12}13?14/**15?* This is the shortcut to Yii::app()->clientScript16?*/17function cs()18{19????// You could also call the client script instance via Yii::app()->clientScript20????// But this is faster21????return Yii::app()->getClientScript();22}23?24/**25?* This is the shortcut to Yii::app()->user.26?*/27function user()28{29????return Yii::app()->getUser();30}31?32/**33?* This is the shortcut to Yii::app()->createUrl()34?*/35function url($route,$params=array(),$ampersand='&')36{37????return Yii::app()->createUrl($route,$params,$ampersand);38}39?40/**41?* This is the shortcut to CHtml::encode42?*/43function h($text)44{45????return htmlspecialchars($text,ENT_QUOTES,Yii::app()->charset);46}47?48/**49?* This is the shortcut to CHtml::link()50?*/51function l($text, $url = '#', $htmlOptions = array())52{53????return CHtml::link($text, $url, $htmlOptions);54}55?56/**57?* This is the shortcut to Yii::t() with default category = 'stay'58?*/59function t($message,$category='stay',$params=array(), $source=null,$language=null)60{61????return Yii::t($category, $message, $params, $source, $language);62}63?64/**65?* This is the shortcut to Yii::app()->request->baseUrl66?* If the parameter is given, it will be returned and prefixed with the app baseUrl.67?*/68function bu($url=null)69{70????static $baseUrl;71????if ($baseUrl===null)72????????$baseUrl=Yii::app()->getRequest()->getBaseUrl();73????return $url===null ? $baseUrl : $baseUrl.'/'.ltrim($url,'/');74}75?76/**77?* Returns the named application parameter.78?* This is the shortcut to Yii::app()->params[$name].79?*/80function param($name)81{82????return Yii::app()->params[$name];83}84/**85?* A useful one that I use in development is the following86?* which dumps the target with syntax highlighting on by default87?*/88function dump($target)89{90??return CVarDumper::dump($target, 10, true) ;91}