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<?php declare(strict_types=1); namespace SpomkyLabs\Pki\X501\StringPrep; /** * Implements 'Insignificant Space Handling' step of the Internationalized String Preparation as specified by RFC 4518. * * This variant handles input strings that are non-substring assertion values. * * @see https://tools.ietf.org/html/rfc4518#section-2.6.1 */ final class InsignificantNonSubstringSpaceStep implements PrepareStep { /** * @param string $string UTF-8 encoded string */ public function apply(string $string): string { // if value contains no non-space characters if (preg_match('/^\p{Zs}*$/u', $string) === 1) { return ' '; } // trim leading and trailing spaces $string = preg_replace('/^\p{Zs}+/u', '', $string); $string = preg_replace('/\p{Zs}+$/u', '', (string) $string); // convert inner space sequences to two U+0020 characters $string = preg_replace('/\p{Zs}+/u', ' ', (string) $string); return " {$string} "; } }
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