Trying to use undefined properties in PHP
stdClass objects gives you a "warning" as of PHP 8 (it used to be a "notice" that, being realistic, you ignored).
One way to fix code that looks like the following is to use the new "null coalescing" operator (
$b line, you get these logs in the different versions of PHP:
Warning: Undefined property: stdClass::$second in /in/DsRb2 on line 6
Output for 5.3.0 - 7.4.16
Notice: Undefined property: stdClass::$second in /in/DsRb2 on line 6