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@ 2018-01-10T08:34:55Z

<?php

class C {
    
}

class A {
    public function b(/* C */ $c) {
        echo 'c';
    }
}

class B extends A {
    public function b(C $c) {
        echo 'd';
    }
}

$c = new C();
$b = new B();
echo $b->b($c);

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This is an error 404