## Runtime Configuration

The behaviour of these functions is affected by settings in php.ini.

Tidy Configuration Options
Name | Default | Changeable | Changelog
--- | --- | --- | ---
tidy.default_config | "" | PHP_INI_SYSTEM |
tidy.clean_output | "0" | PHP_INI_USER | PHP_INI_PERDIR prior to PHP 5.4.0

For further details and definitions of the PHP_INI_* modes, see the Where a configuration setting may be set.

Here's a short explanation of the configuration directives.

`tidy.default_config` string

  Default path for tidy config file.

`tidy.clean_output` bool

  Turns on/off the output repairing by Tidy.

  Warning

  Do not turn on `tidy.clean_output` if you are generating non-html content such as dynamic images.