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<?php class A { protected $var; public function __construct(string $var = '') { $this->var = $var; } public function setVar(string $var) { $this->var = $var; } } class B extends A { public function __construct(A $class) { parent::__construct($class->var); } public function getVar(): string { return $this->var; } } $classA = new A(); $classA->setVar('howdy, partner'); $classB = new B($classA); var_dump($classB->getVar());
Output for git.master, git.master_jit, rfc.property-hooks
string(14) "howdy, partner"

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