bracket-fix.el

(let ((bracket '(progn
                  (put-text-property (match-beginning 1)
                                     (match-end 1) 'display " ❴")
                  nil)))
  (font-lock-add-keywords
   'php-mode `(("function .*(.*)\\(\n *{\\)\n"
                (0 ,bracket))
               ("class .*\\(\n *{\\)\n"
                (0 ,bracket))
               ("trait .*\\(\n *{\\)\n"
                (0 ,bracket)))))