Make php-mode inherit from php-base-mode instead of c-mode

CHANGELOG.md

@@ -9,6 +9,10 @@ All notable changes of the PHP Mode 1.19.1 release series are documented in this
  * Add `php-base-mode` which is the base of php related modes ([#772])
    * `php-base-mode` is designed as a common parent mode for `php-mode` and [`php-ts-mode`](https://github.com/emacs-php/php-ts-mode).
 
+### Changed
+
+ * Make `php-mode` inherit from `php-base-mode` instead of `c-mode` ([#772])
+
 [#772]: https://github.com/emacs-php/php-mode/pull/772
 
 ## [1.25.1] - 2023-11-24

lisp/php-mode.el

@@ -327,6 +327,7 @@ as a function.  Call with AS-NUMBER keyword to compare by `version<'.
 
 (defvar php-mode-map
   (let ((map (make-sparse-keymap "PHP Mode")))
+    (set-keymap-parent map c-mode-base-map)
     ;; Remove menu item for c-mode
     (define-key map [menu-bar C] nil)
 
@@ -1150,14 +1151,14 @@ After setting the stylevars run hook `php-mode-STYLENAME-hook'."
     table))
 
 ;;;###autoload
-(define-derived-mode php-mode c-mode "PHP"
+(define-derived-mode php-mode php-base-mode "PHP"
   "Major mode for editing PHP code.
 
 \\{php-mode-map}"
   :syntax-table php-mode-syntax-table
-  ;; :after-hook (c-update-modeline)
-  ;; (setq abbrev-mode t)
-
+  :after-hook (progn (c-make-noise-macro-regexps)
+                     (c-make-macro-with-semi-re)
+                     (c-update-modeline))
   (unless (string= php-mode-cc-version c-version)
     (php-mode-debug-reinstall nil))
 
@@ -1168,8 +1169,16 @@ After setting the stylevars run hook `php-mode-STYLENAME-hook'."
                      :warning))
 
   (c-initialize-cc-mode t)
+  (setq abbrev-mode t)
+
+  ;; Must be called once as c-mode to enable font-lock for Heredoc.
+  ;; TODO: This call may be removed in the future.
+  (c-common-init 'c-mode)
+
   (c-init-language-vars php-mode)
   (c-common-init 'php-mode)
+  (cc-imenu-init cc-imenu-c-generic-expression)
+
   (setq-local c-auto-align-backslashes nil)
 
   (setq-local comment-start "// ")
@@ -1252,7 +1261,7 @@ After setting the stylevars run hook `php-mode-STYLENAME-hook'."
   (advice-add 'acm-backend-tabnine-candidate-expand
               :filter-args #'php-acm-backend-tabnine-candidate-expand-filter-args)
 
-  (when (>= emacs-major-version 25)
+  (when (eval-when-compile (>= emacs-major-version 25))
     (with-silent-modifications
       (save-excursion
         (let* ((start (point-min))