- Just another place where rewind() might not be set

ext/spl/spl_iterators.c

@@ -2085,7 +2085,9 @@ PHP_FUNCTION(iterator_count)
 	
 	iter = Z_OBJCE_P(obj)->get_iterator(Z_OBJCE_P(obj), obj TSRMLS_CC);
 
-	iter->funcs->rewind(iter TSRMLS_CC);
+	if (iter->funcs->rewind) {
+		iter->funcs->rewind(iter TSRMLS_CC);
+	}
 	while (iter->funcs->valid(iter TSRMLS_CC) == SUCCESS) {
 		count++;
 		iter->funcs->move_forward(iter TSRMLS_CC);