PHP 下载文件时自动添加bom头的方法,
PHP 下载文件时自动添加bom头的方法,
首先弄清楚,什么是bom头?在Windows下用记事本之类的程序将文本文件保存为UTF-8格式时,记事本会在文件头前面加上几个不可见的字符(EF BB BF),就是所谓的BOM(Byte order Mark)。
不仅限于 记事本保存的文件,只要在文件的开口包含了EF BB BF 几个不可见的字符(十六进制应该是是xEFxBBxBF,用二进制编辑文件可见)。这像是一个约定俗成的东西,当系统看到这玩意的时候,就会觉得你这个文件是UTF-8编码的。
如果你的接口是UTF-8的,你需要强制下载一个文件,比如csv.excel在默认情况(中文背景)下,认为csv是GB编码的,所以如果米有bom头,那你给用户呈现的文件,可能就是乱码了。
怎么加bom头呢?
在输出文件之前加上bom头就可以了:
代码如下 复制代码
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