Description:
------------
Running by docker inside the folder with index.php and Foo.php files:

sudo docker run -it --rm -v "$PWD":/usr/src/myapp -w /usr/src/myapp php:8.0.0-cli php index.php

Test script:
---------------
// index.php
<?php
set_error_handler(function ($errno, $errstr) {
	echo "Handler -> $errno, $errstr\n";
	return true;
});

// Checking the handler
gettype($a);

include 'Foo.php';



// Foo.php
<?php
class Foo {
	private final static function bar () {
	}
}

Expected result:
----------------
Handler -> Undefined variable $a
Handler -> Private methods cannot be final as they are never overridden by other classes

Actual result:
--------------
Handler -> Undefined variable $a

Warning: Private methods cannot be final as they are never overridden by other classes in /usr/src/myapp/Foo.php on line 3