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@ 2015-10-05T15:02:28Z

<?php

class Foo
{
    public function setHandler($callable) {
        $callable(is_callable($callable));
    }
}

class Bar extends Foo
{
    public function setHandler(callable $callable) {
        parent::setHandler($callable);
    }
}

$bar = new Bar();
$bar->setHandler('var_dump');

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