php BOM problem

In recent collaborative development projects, I always found that the output of PHP was wrong. The code was exactly the same and it didn't work. Later, I thought there was a problem with the encoding and found out that they were all utf-8. Finally, after deleting the file contents, I found that there were still 3 characters in size. Use the vim -b command. After opening it, I found and I feel like the problem lies here.

Later I found out that this is the BOM in utf-8. What's disgusting is that the BOM will be output along with the echo, causing errors.

Attached are a few commands to find and remove BOM

In vim:

Java code

#Set UTF-8 encoding

:set fileencoding=utf-8

#Add BOM

:set bomb

#Delete BOM

:set nobomb

#Query BOM

:set bomb?

grep:

Java code

//Find

grep -I -r -l $'xEFxBBxBF' / path

//Replacement

grep -I -r -l $'xEFxBBxBF' /path | xargs sed -i 's/^xEFxBBxBF//g'