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<?php $arr = [ 'foo', 'foo', 'bar', 'baz', 'baz' ]; array_walk($arr, function (&$item, $k) use ($arr) { $lower = mb_strtolower($item, 'utf-8'); foreach ($arr as $i => $v) { if ($i !== $k && $lower === mb_strtolower($v, 'utf-8')) { $item = null; } } }); var_dump($arr);
Output for git.master, git.master_jit, rfc.property-hooks
array(5) { [0]=> NULL [1]=> NULL [2]=> string(3) "bar" [3]=> NULL [4]=> NULL }

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