Depending on your build of Emacs and/or the environment it runs in,
multiline comments in PHP with the ‘php-mode’ package use the
font-lock-doc-face instead of font-lock-comment-face.
This seems to make all comments use the appropriate face:
(defun my-multine-comments () (setq-local c-doc-face-name 'font-lock-comment-face)) (add-hook 'php-mode-hook #'my-multine-comments)
As always, re-load the theme for changes to take effect.