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<?php $days = array('2'); function alter_days(&$day) { return $day -= 1; } array_filter($days, 'alter_days'); var_dump($days);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: alter_days(): Argument #1 ($day) must be passed by reference, value given in /in/C5EVo on line 11 array(1) { [0]=> string(1) "2" }

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