I've searched PhpStorm's preferences, documentation, and Google to no avail.
Is there a way to disable by default the "Generate PhpDoc" option in PhpStorm's "Extract Method" dialogue?
I know this is an ancient post, but I struggled with the same question today. In PHPStorm 2017.1 the setting is here:
Preferences > Editor > Intentions > PHP > Generate PHPDoc for function
alt + return intentions menu. Extracting a method still generates the docs by default.