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@ 2017-01-24T13:25:56Z

<?php

//interface I {
//  public function example($a, $b, $c);
//}
class A {
  public function example($a, $b = null, $c = null) { }
}
class B extends A {
  public function example($a, $b, $c = null) { } // not compatible with A::example
}

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This is an error 404