php - What is a line length "soft limit" and how do I interpret this in the PSR-2 convention?

Question

I don't understand this part of php's PSR-2 convention:

The soft limit on line length MUST be 120 characters; automated style checkers MUST warn but MUST NOT error at the soft limit.

Lines SHOULD NOT be longer than 80 characters; lines longer than that SHOULD be split into multiple subsequent lines of no more than 80 characters each.

I thought "soft limit" meant "try to stick to this limit, but a few characters extra are not a problem". But then I read the second line and now I don't get it.

question from:https://stackoverflow.com/questions/14962667/what-is-a-line-length-soft-limit-and-how-do-i-interpret-this-in-the-psr-2-conv

Answer 1

It's pretty easy:

• 0-80: Always ok
• 80-120: Acceptable (if there's a good reason for it, e.g. a string where wrapping it would be ugly)
• 120+: Lint tools, IDEs, etc. MUST show a warning (but never an error!) since the line might be ugly/unreadable/...