实例讲解PHP5 新特性(1)
虽然 PHP5 还没有正式发布（开发版本已经提供下载），但我们现在就可以开始体验一下新的版本 将要带给我们的惊喜。在以下的介绍中，我们将重点讲述PHP5 中的三大特色功能。这三大特点为：
* 新的对象模式 (New Object Mode)
* 异常处理 (Exceptions)
* 名称空间 (Namespace)
在开始之前，要声明两点：
* 文章中的例子为了说明如何操作，有些部分使用了 PHP4 的表现手段，这仅仅是为了提高文章的可读性。* 文章中描述的部分与 PHP5 的最终发布版可能会有一些出入
在 PHP5 没有最终正式发布前，你可以随时从
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