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<?php declare(strict_types=1); interface PhpApplication { public function updateStuff(bool $includeNulls = false): void; } final class Joomla implements PhpApplication { public function updateStuff(bool $includeNulls = true): void { var_dump('nulls included: ' . ($includeNulls ? 'yes' : 'no')); } } (new Joomla())->updateStuff(false); (new Joomla())->updateStuff(true);
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
string(18) "nulls included: no" string(19) "nulls included: yes"

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