Add readonly to semi-reserved

Author: nikic

Zend/tests/grammar/semi_reserved_001.phpt

@@ -45,6 +45,7 @@ class Obj
     function array(){ echo __METHOD__, PHP_EOL; }
     function print(){ echo __METHOD__, PHP_EOL; }
     function echo(){ echo __METHOD__, PHP_EOL; }
+    function readonly(){ echo __METHOD__, PHP_EOL; }
     function require(){ echo __METHOD__, PHP_EOL; }
     function require_once(){ echo __METHOD__, PHP_EOL; }
     function return(){ echo __METHOD__, PHP_EOL; }
@@ -125,6 +126,7 @@ $obj->throw();
 $obj->array();
 $obj->print();
 $obj->echo();
+$obj->readonly();
 $obj->require();
 $obj->require_once();
 $obj->return();
@@ -205,6 +207,7 @@ Obj::throw
 Obj::array
 Obj::print
 Obj::echo
+Obj::readonly
 Obj::require
 Obj::require_once
 Obj::return

Zend/zend_language_parser.y

@@ -307,7 +307,7 @@ reserved_non_modifiers:
 
 semi_reserved:
 	  reserved_non_modifiers
-	| T_STATIC | T_ABSTRACT | T_FINAL | T_PRIVATE | T_PROTECTED | T_PUBLIC
+	| T_STATIC | T_ABSTRACT | T_FINAL | T_PRIVATE | T_PROTECTED | T_PUBLIC | T_READONLY
 ;
 
 ampersand: