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<?php $u = []; $a = [0, 1, 2, 0, 1, 2]; foreach ($a as $v) { if (isset($u[$v])) { continue; } $u[$v] = array_keys($a, $v); } var_dump($u);
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [0]=> array(2) { [0]=> int(0) [1]=> int(3) } [1]=> array(2) { [0]=> int(1) [1]=> int(4) } [2]=> array(2) { [0]=> int(2) [1]=> int(5) } }

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