The way to exclude that specific error message in your ruleset.xml file is to use:
<exclude name="Squiz.Commenting.FileComment.MissingSubpackageTag" />
Use the -s
command line argument to determine the code for a specific error message. You'll see something like this:
Missing @subpackage tag in file comment
(Squiz.Commenting.FileComment.MissingSubpackageTag)
If you want to exclude the whole sniff, you'd instead use:
<exclude name="Squiz.Commenting.FileComment" />
There are a lot of other things you can do in a ruleset file. See the docs for more examples: https://github.com/squizlabs/PHP_CodeSniffer/wiki/Annotated-ruleset.xml