这是我知道的从命令行轻松完成这一操作的最简单的方法：

This is the simplest way I know of to do this easily from the command line:

vim +"argdo se bomb | se fileencoding=utf-8 | w" $(find . -type f -name *.php)

或者更好的是，如果文件数量预计相当大：

Or better yet if the number of files is expected to be pretty large:

find . -type f -name *.php | xargs vim +"argdo se bomb | se fileencoding=utf-8 | w"