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<?php function cluster($array) { $array = array_reverse($array); foreach($array as $element) { $newarray = [$element=>$newarray]; } return $newarray; } var_dump(cluster(['A', 'B', 'C', 'D','E','F','G','H','I']));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $newarray in /in/OIqvH on line 5 array(1) { ["A"]=> array(1) { ["B"]=> array(1) { ["C"]=> array(1) { ["D"]=> array(1) { ["E"]=> array(1) { ["F"]=> array(1) { ["G"]=> array(1) { ["H"]=> array(1) { ["I"]=> NULL } } } } } } } } }

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