Source of Unescaper.php - Zabbix

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        return \chr(0xF0 | $c >> 18).\chr(0x80 | $c >> 12 & 0x3F).\chr(0x80 | $c >> 6 & 0x3F).\chr(0x80 | $c & 0x3F);
 
<?php
​
/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
​
namespace Symfony\Component\Yaml;
​
use Symfony\Component\Yaml\Exception\ParseException;
​
/**
 * Unescaper encapsulates unescaping rules for single and double-quoted
 * YAML strings.
 *
 * @author Matthew Lewinski <matthew@lewinski.org>
 *
 * @internal
 */
class Unescaper
{
    /**
     * Regex fragment that matches an escaped character in a double quoted string.
     */
    const REGEX_ESCAPED_CHARACTER = '\\\\(x[0-9a-fA-F]{2}|u[0-9a-fA-F]{4}|U[0-9a-fA-F]{8}|.)';
​
    /**
     * Unescapes a single quoted string.
     *
     * @param string $value A single quoted string
     *
     * @return string The unescaped string
     */
    public function unescapeSingleQuotedString(string $value): string
    {
        return str_replace('\'\'', '\'', $value);
    }
​
    /**
     * Unescapes a double quoted string.
     *
     * @param string $value A double quoted string
     *
     * @return string The unescaped string
     */
    public function unescapeDoubleQuotedString(string $value): string
    {
        $callback = function ($match) {
            return $this->unescapeCharacter($match[0]);
        };
​
        // evaluate the string
        return preg_replace_callback('/'.self::REGEX_ESCAPED_CHARACTER.'/u', $callback, $value);
    }
​
    /**
     * Unescapes a character that was found in a double-quoted string.
     *
     * @param string $value An escaped character
     *
     * @return string The unescaped character
     */
    private function unescapeCharacter(string $value): string
    {
        switch ($value[1]) {
            case '0':
                return "\x0";
            case 'a':
                return "\x7";
            case 'b':
                return "\x8";
            case 't':
                return "\t";
            case "\t":
                return "\t";
            case 'n':
                return "\n";
            case 'v':
                return "\xB";
            case 'f':
                return "\xC";
            case 'r':
                return "\r";
            case 'e':
                return "\x1B";
            case ' ':
                return ' ';