Company mode won't autocomplete variables with underscores

Question

I have web-mode and company installed but company just seems to autocomplete the variables without underscores:

With Emacs Lisp Mode

With Web-mode

;; --- Company ---
;; Autocomplete with dropdown system

(use-package company
  :ensure t
  
  :init
  
  :config
  (setq company-dabbrev-ignore-case t)
  (setq company-dabbrev-downcase nil)
  
  (setq company-idle-delay 0.2)
  (setq company-echo-delay 0)
  (setq company-minimum-prefix-length 2)
  (setq company-tooltip-minimum-width 110)

  (setq company-dabbrev-code-everywhere t)
  (setq company-dabbrev-code-modes t)
  (setq company-tooltip-align-annotations t)
  (setq company-selection-wrap-around t)

  (setq company-transformers '(company-sort-by-occurrence
                           company-sort-by-backend-importance))

  ;; (define-key global-map (kbd "C-.") 'company-files)
  
  (add-hook 'after-init-hook 'global-company-mode)

  (setq company-backends
        '((company-files
           company-yasnippet
           company-dabbrev
           company-keywords
           company-capf
           company-php
           )))

  )

Answer 1

In your setting of company-backends, don't use company-dabbrev in that group, use company-dabbrev-code.

Answer 2

I found out the problem is not a company problem but the syntax of the mode. By default Emacs consider the underscores as a word separator so the variable new_var are two words instead of one.

To make Emacs consider new_var as one word you have to change the syntax with a hook:

(add-hook 'web-mode-hook (lambda () (modify-syntax-entry ?_ "w")))