Index: ext/standard/string.c
===================================================================
RCS file: /repository/php-src/ext/standard/string.c,v
retrieving revision 1.445.2.14.2.69.2.22
diff -u -p -r1.445.2.14.2.69.2.22 string.c
--- ext/standard/string.c	27 May 2008 10:29:33 -0000	1.445.2.14.2.69.2.22
+++ ext/standard/string.c	9 Jun 2008 08:41:54 -0000
@@ -2233,12 +2233,15 @@ PHP_FUNCTION(substr_replace)
 	}
 	
 	if (Z_TYPE_PP(str) != IS_ARRAY) {
+		SEPARATE_ZVAL(str);
 		convert_to_string_ex(str);
 	}
 	if (Z_TYPE_PP(repl) != IS_ARRAY) {
+		SEPARATE_ZVAL(repl);
 		convert_to_string_ex(repl);
 	}
 	if (Z_TYPE_PP(from) != IS_ARRAY) {
+		SEPARATE_ZVAL(from);
 		convert_to_long_ex(from);
 	}