/* * This file is part of the Symfony package. * * (c) Fabien Potencier * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Symfony\Component\String; if (!\function_exists(u::class)) { function u(?string $string = ''): UnicodeString { return new UnicodeString($string ?? ''); } } if (!\function_exists(b::class)) { function b(?string $string = ''): ByteString { return new ByteString($string ?? ''); } } if (!\function_exists(s::class)) { /** * @return UnicodeString|ByteString */ function s(?string $string = ''): AbstractString { $string = $string ?? ''; return preg_match('//u', $string) ? new UnicodeString($string) : new ByteString($string); } } WidelyUsed – OWASP Jakarta

WidelyUsed