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implode function issues

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linux-howto

http://www.daniweb.com – i have a multiple select drop down menu and i want to implode all the selections that were chosen. can any one offer some assistance on how to do this please. this is what i have so far <?php function form()  { $hostname = "localhost"; $username = "root"; $password = "hayden"; $database = "ecng3020"; $courses_options = ""; $con = mysql_connect("$hostname","$username","$password"); if (!$con)   {   die('Could not connect: ' . mysql_error());   }   mysql_select_db("$database", $con);     $courses_options .= "<option value=\"NULL\">Course :</option>\n";         $try="Select course_code,course_name FROM courses";   $rsrcResult = mysql_query($try); $courses_options .= "<select name=coursecode_1[]  size=4 multiple>";   while($row = mysql_fetch_row($rsrcResult)) {                     $strA=$row[0];                 $strB=$row[1];                                 $courses_options .= "<option value=\"$strA\">$strB</option>\n";   }   $courses_options .= "</select>";  echo <<<EOB  <form method=post action=''>  <p>$courses_options</p>       <p>           <input type="submit" name="submit" value="Submit" />                 <input type="reset" name="Reset" value="Cancel" />   </p> </form> EOB; } ?> <?php @session_start(); form(); if ($_POST['submit'] == 'Submit') { $hostname = "localhost"; $username = "root"; $password = "hayden"; $database = "ecng3020";         $con = mysql_connect("$hostname","$username","$password");         if (!$con)           {                   die('Could not connect: ' . mysql_error());           }         mysql_select_db("$database", $con);                                                                                 //$id=$_SESSION['username'];                                         @$code= $_POST['coursecode_1'];                                         $_SESSION['courses']=$_POST['coursecode_1'];                                                                                 //print_r($_SESSION['courses']);                                                                                                                         if( is_array($code))                                         {                                                         //$sum= array();                                                                                                         while (list ($key, $val) = each ($code))                                                 {                                                         echo $val;                                                         $c=implode(',',$val);                                                         echo "$c<br>";                                                 }                                         } } ?> when i run this code i am getting an error that says Warning: implode() [function.implode]: Invalid arguments passed in....... i am guessing that i need to have another argument for this to work. but how do i get that when all the variables are in an array from the multiple select drop down list thanks in advance (General)