thinkphp命名空间用法实例详解,thinkphp命名空间
thinkphp命名空间用法实例详解,thinkphp命名空间
本文实例讲述了thinkphp命名空间用法。分享给大家供大家参考,具体如下:
新版本(3.2)中采用命名空间的方式定义和加载类库文件,解决多个模块之间的冲突问题,并实现了更加高效的自动加载机制。
需要给类库定义所在的命名空间,命名空间的路径和类库文件的目录一致,就可以实现类的自动加载,例如Org\Util\File类的定义为
namespace Org\Util; class File { }
其所在的路径是ThinkPHP/Library/Org/Util/File.class.php,我们实例化该类写法如下:
复制代码 代码如下:$class = new \Org\Util\File();
系统会自动加载上述文件,这样就不需要在实例化命名空间定义的类之前导入类库文件了。
根命名空间是一个很关键的概念,以上面的Org\Util\File类为例,Org就是一个根命名空间,其对应的初始命名空间目录就是系统的类库目录ThinkPHP/Liberary,该目录下一级子目录会自动识别为根命名空间,这些命名空间无需注册就可使用。
我们在Library目录下面新增一个My根命名空间目录,然后定义一个Test类如下:
namespace My; class Test { public function sayHello() { echo 'hello'; } }
将test类保存在ThinkPHP/Liberary/My/Test.class.php,我们就可以直接实例化和调用
$Test = new \My\Test(); $Test->sayHello();
模块中的类库命名空间是以模块名命名,例如:
namespace Home\Model; class UserModel extends \Think\Model { }
其类文件位于Application/Home/Model/UserModel.class.php
namespace Admin\Event; class UserEvent { }
其类文件位于Application/Admin/Event/UserEvent.class.php
3.2.1版本以上允许设置对应用类库不使用命名空间,在配置文件中设置如下:
复制代码 代码如下:'APP_USE_NAMESPACE' => false,
这样应用类库中不再需要使用命名空间的定义,但是继承和调用核心类库的时候还是需要使用命名空间,例如,下面的应用类库中将不再写namespace Admin\Model;
class UserModel extends \Think\Model { }
特别注意:如果你需要在3.2版本中实例化PHP内置的类库或者第三方的没有使用命名空间定义的类,需要采用下面的方式:
$class = new \stdClass(); $sxml = new \SimpleXmlElement($xmlstr);
希望本文所述对大家基于thinkPHP框架的PHP程序设计有所帮助。
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