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<?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;

/**
 * Escaper encapsulates escaping rules for single and double-quoted
 * YAML strings.
 *
 * @author Matthew Lewinski <matthew@lewinski.org>
 *
 * @internal
 */
class Escaper
{
    // Characters that would cause a dumped string to require double quoting.
    const REGEX_CHARACTER_TO_ESCAPE = "[\\x00-\\x1f]|\xc2\x85|\xc2\xa0|\xe2\x80\xa8|\xe2\x80\xa9";

// Mapping arrays for escaping a double quoted string. The backslash is
    // first to ensure proper escaping because str_replace operates iteratively
    // on the input arrays. This ordering of the characters avoids the use of strtr,
    // which performs more slowly.
    private static $escapees = array('\\', '\\\\', '\\"', '"',
                                     "\x00",  "\x01",  "\x02",  "\x03",  "\x04",  "\x05",  "\x06",  "\x07",
                                     "\x08",  "\x09",  "\x0a",  "\x0b",  "\x0c",  "\x0d",  "\x0e",  "\x0f",
                                     "\x10",  "\x11",  "\x12",  "\x13",  "\x14",  "\x15",  "\x16",  "\x17",
                                     "\x18",  "\x19",  "\x1a",  "\x1b",  "\x1c",  "\x1d",  "\x1e",  "\x1f",
                                     "\xc2\x85", "\xc2\xa0", "\xe2\x80\xa8", "\xe2\x80\xa9",
                               );
    private static $escaped = array('\\\\', '\\"', '\\\\', '\\"',
                                     '\\0',   '\\x01', '\\x02', '\\x03', '\\x04', '\\x05', '\\x06', '\\a',
                                     '\\b',   '\\t',   '\\n',   '\\v',   '\\f',   '\\r',   '\\x0e', '\\x0f',
                                     '\\x10', '\\x11', '\\x12', '\\x13', '\\x14', '\\x15', '\\x16', '\\x17',
                                     '\\x18', '\\x19', '\\x1a', '\\e',   '\\x1c', '\\x1d', '\\x1e', '\\x1f',
                                     '\\N', '\\_', '\\L', '\\P',
                              );

/**
     * Determines if a PHP value would require double quoting in YAML.
     *
     * @param string $value A PHP value
     *
     * @return bool True if the value would require double quotes
     */
    public static function requiresDoubleQuoting(string $value): bool
    {
        return 0 < preg_match('/'.self::REGEX_CHARACTER_TO_ESCAPE.'/u', $value);
    }

/**
     * Escapes and surrounds a PHP value with double quotes.
     *
     * @param string $value A PHP value
     *
     * @return string The quoted, escaped string
     */
    public static function escapeWithDoubleQuotes(string $value): string
    {
        return sprintf('"%s"', str_replace(self::$escapees, self::$escaped, $value));
    }

/**
     * Determines if a PHP value would require single quoting in YAML.
     *
     * @param string $value A PHP value
     *
     * @return bool True if the value would require single quotes
     */
    public static function requiresSingleQuoting(string $value): bool
    {
        // Determines if a PHP value is entirely composed of a value that would
        // require single quoting in YAML.
        if (in_array(strtolower($value), array('null', '~', 'true', 'false', 'y', 'n', 'yes', 'no', 'on', 'off'))) {
            return true;
        }

// Determines if the PHP value contains any single characters that would
        // cause it to require single quoting in YAML.
        return 0 < preg_match('/[ \s \' " \: \{ \} \[ \] , & \* \# \?] | \A[ \- ? | < > = ! % @ ` ]/x', $value);
    }

/**
     * Escapes and surrounds a PHP value with single quotes.
     *
     * @param string $value A PHP value
     *
     * @return string The quoted, escaped string
     */
    public static function escapeWithSingleQuotes(string $value): string
    {
        return sprintf("'%s'", str_replace('\'', '\'\'', $value));
    }
}

Editing: Escaper.php

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