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<?php $array = [ 'Foo', 'bAr', 'BaR', 'fOO', 'baR', ]; $result = []; foreach ($array as $v) { $result[mb_strtoupper($v)] ??= $v; } var_export(array_values($result));
Output for git.master, git.master_jit
array ( 0 => 'Foo', 1 => 'bAr', )

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