Add php class declaration specification face

Author: Demis Balbach

php-face.el

@@ -202,10 +202,15 @@
   :tag "PHPDoc Class Name")
 
 (defface php-class-declaration '((t (:inherit php-keyword)))
-  "Face used to class declarations."
+  "Face used to highlight class declaration keywords"
   :group 'php-faces
   :tag "PHP Class Declaration")
 
+(defface php-class-declaration-spec '((t (:inherit php-keyword)))
+  "Face used to highlight class declaration specification keywords (implements, extends)"
+  :group 'php-faces
+  :tag "PHP Class Declaration Specification")
+
 (define-obsolete-face-alias 'php-annotations-annotation-face 'php-doc-annotation-tag "1.19.0")
 
 (provide 'php-face)

php-mode.el

@@ -1541,6 +1541,9 @@ a completion list."
    `(
      ;; Class declaration keywords (class, trait, interface)
      ("class\\|trait\\|interface" . 'php-class-declaration)
+
+     ;; Class declaration specification keywords (implements, extends)
+     ("implements\\|extends" . 'php-class-declaration-spec)
 
      ;; Highlight variables, e.g. 'var' in '$var' and '$obj->var', but
      ;; not in $obj->var()