## Runtime Configuration

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

Filter Configuration Options
Name | Default | Changeable | Changelog
--- | --- | --- | ---
filter.default | "unsafe_raw" | `INI_PERDIR` | Deprecated as of PHP 8.1.0.
filter.default_flags | NULL | `INI_PERDIR` |

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

Here's a short explanation of the configuration directives.

`filter.default` string

  Filter all $_GET, $_POST, $_COOKIE, $_REQUEST and $_SERVER data by this filter. Original data can be accessed through filter_input().

  Must be the name of a filter which can be determined by using filter_list() and filter_id().

  > Note: Be careful about the default flags for the default filters. They should be set explicitly. For example, to configure the default filter to behave exactly like htmlspecialchars() the default flags must be set to `0`, as shown in the example below.

  > Example #1 Configuring the default filter to act like htmlspecialchars

  > `filter.default = full_special_chars
  > filter.default_flags = 0`

  Warning

  This INI setting is deprecated as of PHP 8.1.0.

`filter.default_flags` int
  Default flags to apply when the default filter is set. This is set to `FILTER_FLAG_NO_ENCODE_QUOTES` by default for backwards compatibility reasons. See `FILTER_FLAG_*` constants for available flags.

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