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<?php // before, in 10.1 class BaseOld { public function __construct() {} public function printTest(): void { print $this->test; } } // after class BaseNew { private bool $test; public function __construct(?bool $test = NULL) { $test = $test ?? TRUE; $this->test = $test; } public function printTest(): void { print $this->test; } } // NOTE: IDENTICAL! class FooOld extends BaseOld { protected bool $test; public function __construct() { parent::__construct(); $this->test = FALSE; } } class FooNew extends BaseNew { protected bool $test; public function __construct() { parent::__construct(); $this->test = FALSE; } } $f = new FooOld(); $f->printTest(); $f = new FooNew(); $f->printTest();