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<?php
declare(strict_types = 1);
namespace Sop\X501\StringPrep;
/**
* Implements 'Prohibit' step of the Internationalized String Preparation
* as specified by RFC 4518.
*
* @see https://tools.ietf.org/html/rfc4518#section-2.4
*/
class ProhibitStep implements PrepareStep
{
* @param string $string UTF-8 encoded string
* @throws \UnexpectedValueException If string contains prohibited characters
* @return string
public function apply(string $string): string
// @todo Implement
return $string;
}