main.php
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interface Vehicle {
  
}

class Car implements Vehicle{
    private $people = array();
    private $capacity;

    public function __construct($capacity) {
      $this->capacity = $capacity;
    }

    public function addPerson($name) {
        if(count($this->people) >= $this->capacity) {
            throw new Exception("Car is already at capacity");
        } else {
            $this->people[] = $name;
        }
    }
    
    public function getPeople() {
      return $this->people; 
    }
    
    public function getCapacity() {
      return $this->capacity;
    }
}

$reflect = new ReflectionClass(new Car(12));
var_dump($reflect->getInterfaceNames());
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