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<?php $a = [ 'a' => 0, 'b' => 0, 'c' => 1 ]; $result = []; foreach ($a as $result[$v][] => $v); var_export($result);
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => array ( 0 => 'a', 1 => 'b', ), 1 => array ( 0 => 'c', ), )

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