Ensure Matomo is functional with PHP 8.4

[tsteur]

PHP 8.4 will be released on 21st Nov 2024 and we need to make sure that Matomo will work with this new version of PHP. That means a release needs to have happened by then.

It's still a few months away but figured to already create the issue now so we can schedule the issue in advance for around the time when the first RC releases come out.

[narfk]

Just a note:
Starting from PHP 8.4, the functions strtok() and md5() are marked as deprecated. Both functions appear frequently in the Matomo code. This won’t throw any errors but may be logged depending on the configuration.

[jostreff]

Fix PHP 8.4 deprecation: Implicitly marking parameter as nullable is deprecated, the explicit nullable type must be used instead - too many such cases in source.

[jostreff]

Also I have errors shown like this:

Deprecated: DI\Definition\Resolver\ObjectCreator::setPrivatePropertyValue(): Optional parameter $className declared before required parameter $propertyValue is implicitly treated as a required parameter in /usr/local/www/matomo/vendor/php-di/php-di/src/Definition/Resolver/ObjectCreator.php on line 212

Deprecated: Constant E_STRICT is deprecated in /usr/local/www/matomo/vendor/symfony/var-dumper/Caster/ExceptionCaster.php on line 44

Deprecated: Constant E_STRICT is deprecated in /usr/local/www/matomo/vendor/symfony/var-dumper/Caster/ExceptionCaster.php on line 44

Deprecated: Constant E_STRICT is deprecated in /usr/local/www/matomo/vendor/symfony/var-dumper/Caster/ExceptionCaster.php on line 44

[jostreff]

My checks are made with
PHP 8.4.0RC2 (cli) (built: Oct 16 2024 18:32:40) (NTS)
Copyright (c) The PHP Group
Zend Engine v4.4.0RC2, Copyright (c) Zend Technologies
with Zend OPcache v8.4.0RC2, Copyright (c), by Zend Technologies

[sgiehl]

For PHP 8.4 we need to disable the error reporting for deprecation notices. While we were able to update all the deprecation notices caused in our code, we are not able to solve those that happen in the vendor libraries we are using.

Unfortunately we can't update libraries like php-di/php-di, as newer versions require at least PHP 8. Same applies for a couple of other libraries. So we may keep deprecation notices disabled for PHP 8.4+ until we dropped support for PHP < 8

[sgiehl]

Just a note:
Starting from PHP 8.4, the functions strtok() and md5() are marked as deprecated. Both functions appear frequently in the Matomo code. This won’t throw any errors but may be logged depending on the configuration.

Neither strtok() nor md5() have been deprecated with PHP 8.4. The suggestions to deprecate those methods have been rejected. See https://wiki.php.net/rfc/deprecations_php_8_4