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<?php $arr = array(); $arr["a"] = "A"; $arr["b"] = "B"; $str = array_filter($arr, function($e1){ echo $e1; return $e1; }); var_dump($str);
Output for git.master, git.master_jit, rfc.property-hooks
ABarray(2) { ["a"]=> string(1) "A" ["b"]=> string(1) "B" }

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