[Error]Namespace declaration statement has to be the very first statement in the script
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php中出现以下错误：
Namespace declaration statement has to be the very first statement in the script
原因如下：
命名空间声明语句必须在脚本的最前面。
<?php的声明必须在脚本的第一句，即使空格、空行也不行。
然而，在dreamweaver中我的代码<?php前面没有空行和空格依然会报这种错误。原因是我使用记事本打开修改了编码，记事本打开后文件被加入了BOM头。
解决方法如下：
在dreamweaver中，点击菜单修改->页面属性->标题/编码，去掉“包括Unicode签名(BOM)”前面的勾即可。
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