polymorphisme concept

polymorphisme.php

    class T
    {
        private $type;

        public function __construct(A $a)
        {
            $this->setType($a);
        }

        public function getType()
        {
            return $this->type->getType();
        }

        public function setType(A $a)
        {
            $this->type = $a;
        }
    }

    interface A
    {
        public function getType();
    }

    class B implements A
    {
        public function getType()
        {
            echo __CLASS__, PHP_EOL;
        }
    }

    class C implements A
    {
        public function getType()
        {
            echo __CLASS__, PHP_EOL;
        }
    }

    $b = new B();
    ($t = new T($b))->getType();
    $c = new C();
    $t->setType($c);
    $t->getType();