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<?php
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$list1 = "4, 5, 6, 7";
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$list2 = "4, 5, 7, 8";
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// combine both lists with unique values only
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$result = implode("," , array_unique(array_merge(explode(",",$list1),explode(",", $list2))));
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echo $result."\n";
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?>
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