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<?php abstract class A { protected $a; protected $b; abstract public function __construct($a); } class B extends A { public function __construct($a) { $this->a = $a; } } class C extends A { public function __construct($a, $b = null) { $this->a = $a; $this->b = $b; } } $b = new B(1); $c = new C(1, 2);
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