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diff -up Zend/zend_compile.c.old Zend/zend_compile.c
--- Zend/zend_compile.c.old	2013-12-20 18:54:27.817018413 +0100
+++ Zend/zend_compile.c	2013-12-20 18:54:37.015050252 +0100
@@ -3209,7 +3209,7 @@ static zend_bool zend_do_perform_impleme
 		}
 
 		/* by-ref constraints on arguments are invariant */
-		if (fe->common.arg_info[i].pass_by_reference != proto->common.arg_info[i].pass_by_reference) {
+		if ((fe->common.arg_info[i].pass_by_reference>0) != (proto->common.arg_info[i].pass_by_reference>0)) {
 			return 0;
 		}
 	}