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Display unique values

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I am trying to display week number in a drop down menu.
I managed to display the numbers but not distinct.
I´ve tried using array_unique but i´m not sure how to implement it. (below code shows how I tried to use array_unique.


$sql="SELECT Date FROM maildata ORDER BY Date ASC";
  $result = mysql_query($sql) or die(mysql_error());  
   while($row = mysql_fetch_array($result)){
   $date_string = date($row['Date']);
   $week = array_unique($date_string);
   $options .="<option>". date("W", strtotime($week))."</option>";

   <SELECT name="week">
   <OPTION VALUE="">Choose week
Edited by Makke_
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Since $date_string is not an array, that code should report an error.


To use array_unique() you would need to collect all of the week numbers in an array, then call it against that array.


On the other hand, you should select DISTINCT dates so you don't process the same date multiple times. In fact, you could do the week number and distinct in the query (mySql WEEK):

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