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<?php declare(strict_types=1);
/*
 * This file is part of PHPUnit.
 *
 * (c) Sebastian Bergmann <sebastian@phpunit.de>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace PHPUnit\Util;

use const ENT_QUOTES;
use function htmlspecialchars;
use function mb_convert_encoding;
use function ord;
use function preg_replace;
use function strlen;

/**
 * @no-named-arguments Parameter names are not covered by the backward compatibility promise for PHPUnit
 *
 * @internal This class is not covered by the backward compatibility promise for PHPUnit
 */
final class Xml
{
    /**
     * Escapes a string for the use in XML documents.
     *
     * Any Unicode character is allowed, excluding the surrogate blocks, FFFE,
     * and FFFF (not even as character reference).
     *
     * @see https://www.w3.org/TR/xml/#charsets
     */
    public static function prepareString(string $string): string
    {
        return preg_replace(
            '/[\\x00-\\x08\\x0b\\x0c\\x0e-\\x1f\\x7f]/',
            '',
            htmlspecialchars(
                self::convertToUtf8($string),
                ENT_QUOTES,
            ),
        );
    }

private static function convertToUtf8(string $string): string
    {
        if (!self::isUtf8($string)) {
            $string = mb_convert_encoding($string, 'UTF-8');
        }

return $string;
    }

private static function isUtf8(string $string): bool
    {
        $length = strlen($string);

for ($i = 0; $i < $length; $i++) {
            if (ord($string[$i]) < 0x80) {
                $n = 0;
            } elseif ((ord($string[$i]) & 0xE0) === 0xC0) {
                $n = 1;
            } elseif ((ord($string[$i]) & 0xF0) === 0xE0) {
                $n = 2;
            } elseif ((ord($string[$i]) & 0xF0) === 0xF0) {
                $n = 3;
            } else {
                return false;
            }

for ($j = 0; $j < $n; $j++) {
                if ((++$i === $length) || ((ord($string[$i]) & 0xC0) !== 0x80)) {
                    return false;
                }
            }
        }

return true;
    }
}

✏️ Editing: Xml.php

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