PHP错误：Namespace declaration statement has to be the very first statement in the script

原因：意思就是“namespace声明应写在第一行”。其实我们的代码是写在第一行的，原因就在于文本的格式！

解决方式：

方法一：该文件有BOM头问题，使用文本编辑器（比如UE），另存为UTF-8 时，选择无BOM头即可。

方法二：用系统建个纯txt文本，把名字（包括扩展名），如改成build.class.php代码内容复制过来，根本不用改变。保存。运行即可。

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