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<?php class Car { protected $speed = 0; protected $people = 0; public function onboardPerson() { $this->people++; } public function accelerate() { $this->speed++; } } class Taxi extends Car { protected $fare; public function setFare($fare) { $this->fare = $fare; } } $taxi = new Taxi(); // Replace instances of type Car (T) with subtype Taxi (S) $taxi->onboardPerson(); $taxi->accelerate(); var_dump($taxi);
Output for git.master, git.master_jit, rfc.property-hooks
object(Taxi)#1 (3) { ["speed":protected]=> int(1) ["people":protected]=> int(1) ["fare":protected]=> NULL }

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