'r' is not initialized unless walk_to_top is set:

Index: sapi/apache2handler/php_functions.c
===================================================================
RCS file: /repository/php-src/sapi/apache2handler/php_functions.c,v
retrieving revision 1.1.2.9
diff -u -r1.1.2.9 php_functions.c
--- sapi/apache2handler/php_functions.c 10 Jul 2003 22:45:34 -0000      1.1.2.9
+++ sapi/apache2handler/php_functions.c 10 Nov 2003 12:26:15 -0000
@@ -259,8 +259,8 @@
 
        ctx = SG(server_context);
 
+       r = ctx->r;
        if (arg_count == 3 && Z_STRVAL_PP(walk_to_top)) {
-        r = ctx->r;
                while(r->prev) {
                        r = r->prev;
                }       

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