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Edit File: QuoteAwareConstExprStringNode.php

<?php declare(strict_types = 1);

namespace PHPStan\PhpDocParser\Ast\ConstExpr;

use PHPStan\PhpDocParser\Ast\NodeAttributes;
use function addcslashes;
use function assert;
use function dechex;
use function ord;
use function preg_replace_callback;
use function sprintf;
use function str_pad;
use function strlen;
use const STR_PAD_LEFT;

class QuoteAwareConstExprStringNode extends ConstExprStringNode implements ConstExprNode
{

public const SINGLE_QUOTED = 1;
	public const DOUBLE_QUOTED = 2;

use NodeAttributes;

/** @var self::SINGLE_QUOTED|self::DOUBLE_QUOTED */
	public $quoteType;

/**
	 * @param self::SINGLE_QUOTED|self::DOUBLE_QUOTED $quoteType
	 */
	public function __construct(string $value, int $quoteType)
	{
		parent::__construct($value);
		$this->quoteType = $quoteType;
	}

public function __toString(): string
	{
		if ($this->quoteType === self::SINGLE_QUOTED) {
			// from https://github.com/nikic/PHP-Parser/blob/0ffddce52d816f72d0efc4d9b02e276d3309ef01/lib/PhpParser/PrettyPrinter/Standard.php#L1007
			return sprintf("'%s'", addcslashes($this->value, '\'\\'));
		}

// from https://github.com/nikic/PHP-Parser/blob/0ffddce52d816f72d0efc4d9b02e276d3309ef01/lib/PhpParser/PrettyPrinter/Standard.php#L1010-L1040
		return sprintf('"%s"', $this->escapeDoubleQuotedString());
	}

private function escapeDoubleQuotedString(): string
	{
		$quote = '"';
		$escaped = addcslashes($this->value, "\n\r\t\f\v$" . $quote . '\\');

// Escape control characters and non-UTF-8 characters.
		// Regex based on https://stackoverflow.com/a/11709412/385378.
		$regex = '/(
              [\x00-\x08\x0E-\x1F] # Control characters
            | [\xC0-\xC1] # Invalid UTF-8 Bytes
            | [\xF5-\xFF] # Invalid UTF-8 Bytes
            | \xE0(?=[\x80-\x9F]) # Overlong encoding of prior code point
            | \xF0(?=[\x80-\x8F]) # Overlong encoding of prior code point
            | [\xC2-\xDF](?![\x80-\xBF]) # Invalid UTF-8 Sequence Start
            | [\xE0-\xEF](?![\x80-\xBF]{2}) # Invalid UTF-8 Sequence Start
            | [\xF0-\xF4](?![\x80-\xBF]{3}) # Invalid UTF-8 Sequence Start
            | (?<=[\x00-\x7F\xF5-\xFF])[\x80-\xBF] # Invalid UTF-8 Sequence Middle
            | (?<![\xC2-\xDF]|[\xE0-\xEF]|[\xE0-\xEF][\x80-\xBF]|[\xF0-\xF4]|[\xF0-\xF4][\x80-\xBF]|[\xF0-\xF4][\x80-\xBF]{2})[\x80-\xBF] # Overlong Sequence
            | (?<=[\xE0-\xEF])[\x80-\xBF](?![\x80-\xBF]) # Short 3 byte sequence
            | (?<=[\xF0-\xF4])[\x80-\xBF](?![\x80-\xBF]{2}) # Short 4 byte sequence
            | (?<=[\xF0-\xF4][\x80-\xBF])[\x80-\xBF](?![\x80-\xBF]) # Short 4 byte sequence (2)
        )/x';
		return preg_replace_callback($regex, static function ($matches) {
			assert(strlen($matches[0]) === 1);
			$hex = dechex(ord($matches[0]));

return '\\x' . str_pad($hex, 2, '0', STR_PAD_LEFT);
		}, $escaped);
	}

}

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