From 984c8f87d2ca3840c3d3551713e1eff15aedd712 Mon Sep 17 00:00:00 2001
From: Dmitry Stogov <dmitry@zend.com>
Date: Fri, 30 May 2014 11:12:24 +0400
Subject: [PATCH] Avoid useless duplication of immutable arrays

---
 Zend/zend_execute.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Zend/zend_execute.c b/Zend/zend_execute.c
index 37539d6ffec..0cfd8f456c0 100644
--- a/Zend/zend_execute.c
+++ b/Zend/zend_execute.c
@@ -729,8 +729,10 @@ static inline void zend_assign_to_object(zval *retval, zval *object_ptr, zval *p
 		ZVAL_COPY_VALUE(&tmp, value);
 		value = &tmp;
 	} else if (value_type == IS_CONST) {
-		ZVAL_DUP(&tmp, value);
-		value = &tmp;
+		if (UNEXPECTED(Z_OPT_COPYABLE_P(value))) {
+			ZVAL_DUP(&tmp, value);
+			value = &tmp;
+		}
 	} else if (Z_REFCOUNTED_P(value)) {
 		Z_ADDREF_P(value);
 	}