0x00缘起

代码部署在windows上，出现了一个bug，临时用记事本打开修改了一下，于是出现了500错误

0x01排错

查看log，提示如下
“Namespace declaration statement has to be the very first statement or after any declare call in the script xxx.controller”。于是看这个php文件，什么也没发现。
一头雾水，只好在网上找了一下，没想到是万恶的bom引起的。

0x03解决办法

重新保存为utf-8无bom格式。

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