--TEST-- ob_start(): ensure buffers can't be added from within callback. --FILE-- <?php /* * proto bool ob_start([ string|array user_function [, int chunk_size [, bool erase]]]) * Function is implemented in main/output.c */ function f($str) { ob_start(); echo "hello"; ob_end_flush(); return $str; } var_dump(ob_start('f')); echo "done"; ?> --EXPECTF-- Fatal error: ob_start(): Cannot use output buffering in output buffering display handlers in %s on line 9