add support for ::foo syntax meaning "global one"

Author: smalyshev

Zend/zend_compile.c

@@ -1167,8 +1167,13 @@ void do_fetch_class(znode *result, znode *namespace_name, znode *class_name TSRM
 		SET_UNUSED(opline->op1);
 		CG(catch_begin) = fetch_class_op_number;
 	}
-	zend_str_tolower(class_name->u.constant.value.str.val, class_name->u.constant.value.str.len);
-	if ((class_name->u.constant.value.str.len == (sizeof("self") - 1)) &&
+	if(class_name) {
+		zend_str_tolower(class_name->u.constant.value.str.val, class_name->u.constant.value.str.len);
+	}
+	if(class_name == NULL) {
+		SET_UNUSED(opline->op2);
+		opline->extended_value = ZEND_FETCH_CLASS_MAIN;
+	} else if ((class_name->u.constant.value.str.len == (sizeof("self") - 1)) &&
 		!memcmp(class_name->u.constant.value.str.val, "self", sizeof("self"))) {
 		SET_UNUSED(opline->op2);
 		opline->extended_value = ZEND_FETCH_CLASS_SELF;

Zend/zend_language_parser.y

@@ -625,6 +625,7 @@ function_call:
 parse_class_entry:
 		T_NAMESPACE_NAME T_PAAMAYIM_NEKUDOTAYIM T_STRING T_PAAMAYIM_NEKUDOTAYIM { do_fetch_class(&$$, &$1, &$3 TSRMLS_CC); }
 	|	T_STRING T_PAAMAYIM_NEKUDOTAYIM { do_fetch_class(&$$, NULL, &$1 TSRMLS_CC); }
+	|	T_PAAMAYIM_NEKUDOTAYIM { do_fetch_class(&$$, NULL, NULL TSRMLS_CC);  }
 ;
 
 catch_class_entry: