<?php class A { protected $var = ''; public function setVar(string $var) { $this->var = $var; } } class B extends A { public function getVarFrom(A $class): string { return $class->var; } } $classA = new A(); $classA->setVar('howdy, partner'); $classB = new B(); var_dump($classB->getVarFrom($classA));
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