Namespace declaration statement has to be the very first statement in the script
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php 中
Namespace declaration statement has to be the very first statement in the script 错误解决方法：
在PHP文件中编写有namespace 时候提示此错误，应该将 <?php 开始前面不能有语句，空行也不行。
如果是在含有<html>语言的混合php 文件里面，且文件里面至少有一个<?php ?>代码段时候，只要用到namespace,该文件的首行必须以<?php开头.
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