im trying to write a code where can print and loop through the contents of my session variable by using a foreach statement

here is my code

<form class="form form-inline" method = "post" action="reportmaker.php">
<select name="rfield">
<option value="">--Select Field--</option>
<?php
    $sc2=mysql_query("SELECT * from searchcolumn s left join report_fields r on s.scol_id=r.field_id where s.category != 'wh'");
    foreach($sc2 as $sc){
 ?>

<option value="<?php echo $sc[advsearch_col]; ?>"><?php echo $sc[advsearch_name]; ?></option>

 <?php
  }
 ?>
 </select>
 <button type="submit" value = "submit" id="add" name="add" class="btn pull-right">Add More</button>

</form>

<?php
        if(isset($_POST['add']))
            {
            $_SESSION['temp'][]=$_POST['rfield'];   

            }
        if($_SESSION[temp][]!=""){
            foreach($_SESSION[temp][] as $temp)
            {
        echo $temp;
            }
        }
        ?>

the error that appears with this code is

Fatal error: Cannot use [] for reading

the line where the error is is this

if($_SESSION[temp][]!=""){

i need to print the contents of the session array and this is the only way i know how is there a way to fix this?

thanks

=========EDIT

thanks for the answers guys i finally got it