Add syntax highlight not supported by current php-mode

Author: zonuexe

php-mode-test.el

@@ -721,7 +721,12 @@ style from Drupal."
     (search-forward "SpaceName")
     (goto-char (match-beginning 0))
     (should (eq 'php-constant
-                (get-text-property (point) 'face)))))
+                (get-text-property (point) 'face)))
+    (search-forward-regexp "\\\\My_\\(Class\\)")
+    (should (eq 'php-constant
+                (get-text-property (match-beginning 0) 'face)))
+    (should (eq 'php-constant
+                (get-text-property (match-beginning 1) 'face)))))
 
 (ert-deftest php-mode-test-variables()
   "Proper highlighting for variables."

tests/identifiers.php

@@ -12,4 +12,5 @@
 // When calling a method, the class name should be highlighted with
 // the constant face. Just like c++-mode "NS::Class::method()"
 ClassName::method();
-\SpaceName\ClassName::method();
+\SpaceName\ClassName::method();
+\My_Class::method();