Whitelist

This filter will return null if the value being filtered is not present the filter’s allowed list of values. If the value is present, it will return that value.

For the opposite functionality see the Blacklist filter.

Supported Options

The following options are supported for Zend\Filter\Whitelist:

• strict: Uses strict mode when comparing: passed through to in_array‘s third argument.
• list: An array of allowed values.

Basic Usage

This is a basic example:

$whitelist = new \Zend\Filter\Whitelist(array(
    'list' => array('allowed-1', 'allowed-2')
));
echo $whitelist->filter('allowed-2');   // => 'allowed-2'
echo $whitelist->filter('not-allowed'); // => null