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<?php $arr = array('hey' => 1, 'there' => 0, 'blimpie' => 2); $arr = array_keys(array_filter($arr), function($i) { return $i == 2; }); print_r($arr);
Output for git.master, git.master_jit, rfc.property-hooks
Notice: Object of class Closure could not be converted to int in /in/GPOC1 on line 4 Notice: Object of class Closure could not be converted to int in /in/GPOC1 on line 4 Array ( [0] => hey )

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