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<?php var_dump(array_map(function($x, $y) { return $x.$y; }, array(1=>'1', 2=>'2'), array(2=>'2', 1=>'1', '6')));
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [0]=> string(2) "12" [1]=> string(2) "21" [2]=> string(1) "6" }

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