当一个数组中的字符串与第二个数组中的字符串不同时获取字符串值

This is my Snippet:

foreach ($Susers as $su)
  {
    foreach ($Tuser as $tu)
     {
       if ($tu["NICK"] !== $su["Name"])
       {
         echo " " . $tu["NICK"] . " have bad nickname <br />";
       }
   }
}

I try to get nicknames from one array if they are not the same as names in second array but with this loop I get every single nickname from $Tuser array. Can you guys help me with this?