PHP_OUTPUT_HANDLER_HOOK_IMMUTABLE  366 ext/iconv/iconv.c 				php_output_handler_hook(PHP_OUTPUT_HANDLER_HOOK_IMMUTABLE, NULL TSRMLS_CC);
PHP_OUTPUT_HANDLER_HOOK_IMMUTABLE  236 ext/zlib/zlib.c 				php_output_handler_hook(PHP_OUTPUT_HANDLER_HOOK_IMMUTABLE, NULL TSRMLS_CC);
PHP_OUTPUT_HANDLER_HOOK_IMMUTABLE  700 main/output.c  			case PHP_OUTPUT_HANDLER_HOOK_IMMUTABLE: