Question about Single Dot Concatenation

Like any other coding standard, it was a preference of the person who wrote the style guide. All methods have pros and cons, and the style guide only applies to the framework itself, not your code, so if you prefer to put spaces around it - go for it!

We actually went with spaces around dots in the CodeIgniter4-Standard for PHP Codesniffer. The style guides a little out of date/(TBC)