Array (
    [events]       => Array
    [fromdate]     => February 12, 2014 3:10 PM
    [todate]       => February 19, 2014 3:10 PM
    [description]  => hfhhhhhhhhhhhhhhhhhh
    [subject]      => fhhhhhhhhhhhhhhhhhh
    [fromname]     => gjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj
    [replyto]      => gjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj
    [senddatetime] => February 12, 2014 3:10 PM
    [timezone]     => America/Los_Angeles
    [message]      =>

                 dhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh
    [submit_skip]  => Continue
)

$select = sprintf ("SELECT event_id,event_name
                              FROM `events`
                              WHERE (`user_id` = '%s') order by event_name",
                            $GLOBALS ['mysqli']->real_escape_string ($_SESSION['user_id']));

        $res = $GLOBALS ['mysqli']->query ($select) or die ($GLOBALS ['mysqli']->error . __LINE__);
        if ($res->num_rows > 0)
        {
            while($row = $res->fetch_assoc ())
            {
                foreach( $_POST['events'] as $val ){ ?>

                     <option value="<?= $row['event_id'];
                         if($row['event_id'] == $val) echo "selected";
                     ?>">
                         <?=$row['event_name']?>
                     </option>

                     <?
                 }
             }
        }
        ?>
        </select>

Warning:  Invalid argument supplied for foreach() in C:wampwwwticket_inspector_newforms_hd87wblfo084wgdtryform_email_compose

<?php
    $x = array (
        'events'       => array(),
        'fromdate'     => 'February 12, 2014 3:10 PM',
        'todate'       => 'February 19, 2014 3:10 PM',
       // So on .....
    );

    $check = $x['events'];

    var_dump($check);

    ?>

            <option value="<?php echo $row['event_id']; ?>"<?php if(in_array($row['event_id'],$check)) { ?> selected="selected" <?php } ?> ><?php echo $row['event_name']?></option>