Functionality Deprecated in PHP 8.5

[Cr0aten]

Receiving the following deprecation message with v3.1.3 running php 8.5 RC2:

PHP Deprecated: ord(): Providing an empty string is deprecated in \vendor\dompdf\php-font-lib\src\FontLib\BinaryStream.php on line 161

[8ctopus]

Here's the detailed issue in php 8.5

PHPUnit 12.4.4 by Sebastian Bergmann and contributors.

Runtime:       PHP 8.5.0
Configuration: K:\dev\github\php-font-lib\phpunit.xml

..DD                                                                4 / 4 (100%)

Time: 00:02.423, Memory: 16.00 MB

2 tests triggered 1 PHP deprecation:

1) K:\dev\github\php-font-lib\src\FontLib\BinaryStream.php:161
ord(): Providing an empty string is deprecated

Triggered by:

* FontLib\Tests\FontTest::testGetFontInfoTTF (236 times)
  K:\dev\github\php-font-lib\tests\FontLib\FontTest.php:32

* FontLib\Tests\FontTest::testTTFCmap (85 times)
  K:\dev\github\php-font-lib\tests\FontLib\FontTest.php:46

[8ctopus]

The source of the problem is that the following expression is deprecated in php 8.5

var_dump(ord(''));
// int(0)

and needs to be replaced by

var_dump(ord('0'));
// int(0)

This happens here:

https://github.com/8ctopus/php-font-lib/blob/9b42ff4995cb53d3a2f7edd016f0ed39a70887a7/src/FontLib/BinaryStream.php#L160-L162

when read returns an empty string.

https://github.com/8ctopus/php-font-lib/blob/9b42ff4995cb53d3a2f7edd016f0ed39a70887a7/src/FontLib/BinaryStream.php#L144-L150