private $name, $lastname; public function __construct($name, $lastname) { $this->name = $name; $this->lastname = $lastname; } public function GetFullName() { return $this->name . " " . $this->lastname; } } class ChildClass extends ParentClass { private $age; public function __construct($name, $lastname, $age) { parent::__construct($name, $lastname); $this->age = $age; } public function GetAge() { return $this->age; } public function asd() { return $this->GetFullName(); } } $obj = new ChildClass("Pedro", "Sanchez", 30); echo "<p>Nombre completo: <b>{$obj->asd()}</b></p>"; echo "<p>Edad: <b>{$obj->GetAge()}</b></p>";