PHP_OUTPUT_HANDLER_HOOK_IMMUTABLE  433 ext/iconv/iconv.c 				php_output_handler_hook(PHP_OUTPUT_HANDLER_HOOK_IMMUTABLE, NULL);
PHP_OUTPUT_HANDLER_HOOK_IMMUTABLE  258 ext/zlib/zlib.c 				php_output_handler_hook(PHP_OUTPUT_HANDLER_HOOK_IMMUTABLE, NULL);
PHP_OUTPUT_HANDLER_HOOK_IMMUTABLE  683 main/output.c  			case PHP_OUTPUT_HANDLER_HOOK_IMMUTABLE: