PHP highlighter missing operators and keywords

[mprz1024]

We're missing highlighting for :: -> ... and #[ , as well as keywords such as exit, unset or var, and the $ sign is not an operator but part of a variable name; variables look awful otherwise. I've modified highlights.scm for this with these changes (but I couldn't get var to work):

@@ -70,18 +70,20 @@
 ; Variables
 
+(variable_name
+  "$" @punctuation.special
+  (name) @variable)

@@ -153,9 +155,19 @@
 
   "@"
 
-  "$"
+  "::"
+  "->"
+  "..."
 ] @operator

+; Delimiters
+
+[
+  ","
+  ";"
+  "=>"
+] @punctuation.delimiter
+
 ; punctuation

@@ -165,6 +177,7 @@
   "]"
   "{"
   "}"
+  "#["
 ] @punctuation.bracket

@@ -195,8 +208,8 @@
 "endswitch" @keyword
 "endwhile" @keyword
 "extends" @keyword
+"exit" @keyword
 "final" @keyword
 "finally" @keyword
 "for" @keyword
 "foreach" @keyword
@@ -228,6 +241,7 @@
 "throw" @keyword
 "trait" @keyword
 "try" @keyword
+"unset" @keyword
 "use" @keyword
 "while" @keyword
 "xor" @keyword