How to display selected Multiple dropdown values in edit page php

Question

i'm getting one problme.i'm unable to display selected dropdon values in edit form.while adding i'm storing dropdon values with , seperated in database field.

code:
 <select name='weekoff[]' id='weekoff' multiple>
                          <option value="Monday">Monday</option>
                          <option value="Tuesday">Tuesday</option>
                          <option value="Wednesday">Wednesday</option>
                          <option value="Thursday">Thursday</option>
                           <option value="Friday">Friday</option>
                            <option value="Saturday">Saturday</option>
                             <option value="Sunday">Sunday</option>
                        </select>

if(isset($_REQUEST['weekoff'])){
  $dbCheckbox = implode(',',$_REQUEST['weekoff']);
}

database Storing Format:Monday,Sunday

how to display selected values in edit form:
edit.php:
<?php 
                                       // $dbCheckbox = explode(',',$row['UNIT_WEEKOFF']);
                                       $weekendArr = array();
                                       $weekendArr[] =$row['UNIT_WEEKOFF'];

                    //print_r($weekendArr);
                    $weekendArr = explode(",",$weekendArr) ;
                    //echo $weekendArr;
                                      ?>
                                  <select name='weekoff[]' id='weekoff' multiple>
    <option value="Monday" <?php echo (isset($weekendArr) && in_array('Monday', $weekendArr) ) ? "selected" : "" ?>>Monday</option>
    <option value="Tuesday" <?php echo (isset($weekendArr) && in_array('Tuesday', $weekendArr) ) ? "selected" : "" ?>>Tuesday</option>
    <option value="Wednesday" <?php echo (isset($weekendArr) && in_array('Wednesday', $weekendArr) ) ? "selected" : "" ?>>Wednesday</option>
    <option value="Thursday">Thursday</option>
    <option value="Friday">Friday</option>
    <option value="Saturday">Saturday</option>
    <option value="Sunday">Sunday</option>

Answer 1

Hope this will help you

Suppose you are retrieving data from DB like

$weekendArr = array(); //First define blank array so you will fill it with your DB values
while($row = mysql_fetch_assoc($query)){
   $weekendArr[] = $row['weekoff']; 
}
$weekendArr = explode(",",$weekendArr) ;

Then use this array like

<select name='weekoff[]' id='weekoff' multiple>
        <option value="Monday" <?php echo (isset($weekendArr) && in_array('Monday, $weekendArr) ) ? 'selected="selected"' : "" ?>>Monday</option>
        <option value="Tuesday" <?php echo (isset($weekendArr) && in_array('Tuesday, $weekendArr) ) ? 'selected="selected"' : "" ?>>Tuesday</option>
        <option value="Wednesday" <?php echo (isset($weekendArr) && in_array('Wednesday, $weekendArr) ) ? 'selected="selected"' : "" ?>>Wednesday</option>
        <option value="Thursday">Thursday</option>
        <option value="Friday">Friday</option>
        <option value="Saturday">Saturday</option>
        <option value="Sunday">Sunday</option>
</select>

Apply this to every option.