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<?php $array = explode(',', 'Katha,pooja,singer,katha'); $result = []; foreach ($array as $value) { $result[strtolower($value)] ??= $value; } var_export(array_values($result));
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
array ( 0 => 'Katha', 1 => 'pooja', 2 => 'singer', )

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