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<?php $array = [ "GL001_M", "GL001_XL", "GL001_S", "GL001_L", "GL002_M", "GL002_XS", "GL002_S", "GL002_L" ]; define('SIZES', array_flip(['XXS', 'XS', 'S', 'M', 'L', 'XL', 'XXL'])); $ids = []; $sizes = []; foreach ($array as $v) { [$ids[], $size] = explode('_', $v, 2); $sizes[] = SIZES[$size]; } array_multisort($ids, $sizes, $array); var_export($array);

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