The behaviour of these functions is affected by settings in php.ini.
|filter.default||"unsafe_raw"||PHP_INI_PERDIR||PHP_INI_ALL in filter <= 0.9.4. Available since PHP 5.2.0.|
|filter.default_flags||NULL||PHP_INI_PERDIR||PHP_INI_ALL in filter <= 0.9.4. Available since PHP 5.2.0.|
Here's a short explanation of the configuration directives.
Accepts the name of the filter you like to use by default. See the existing filter list for the list of the filter names.
Be careful about the default flags for the default filters. You should explicitly set them to the value you want. For example, to configure the default filter to behave exactly like htmlspecialchars() you need to set them default flags to 0 as shown below.
Example #1 Configuring the default filter to act like htmlspecialchars
filter.default = full_special_chars
filter.default_flags = 0
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 the flag list for the list of all the flag names.