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157.96 ms | 1390 KiB | 7 Q<?php
class A { }
class B { public function m(A $a = NULL, &$n) { echo "B.m";} };
class C extends B { public function m( $a ) { echo "C.m";} };
$b = new B();
$b->m(new A(), $b);
$c = new C();
$c->m(new A(), $b);
?>