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<?php declare(strict_types=1); class Dummy { } class Parental { public function __set($name, $val) { printf("Setting %s to %s\n", $name, var_export($val, true)); $this->{$name} = $val; } } class Demo extends Parental { private Dummy $x; public function test() { $this->x = new Dummy(); } } $d = new Demo(); $d->test(); print_r($d);

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