[PHP] trim string

[Wen Ni Leong]

I need help in this basic string function.
I query from the database by using while loop and the result in in
array.  I separated them by using "," .

I want at the end of the string to be trim off.  Unfortunately I tried
all the string function such as chop,trim and substr but they seem like
can't manage to trim the end of the string.  Please help me.

my coding are:

$db = mysql_select_db("tkenet_db");
$query = "SELECT app_name,status FROM approval_list where doc_no='6'";
$result = mysql_query($query,$db);
while($data = mysql_fetch_row($result)){ 

     $cc .= $h->get_email($data[0]).",";

   if ($data[1] != 'Y')
     { $all_yes = 1;}
  }
 trim($cc);

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