<?php 
$sql = "SELECT * FROM markt ";
$data = DB::getInstance()->query($sql);
foreach ($data->results() as $rij) {
    echo '<option   ';
    if ($opdrachtgever == $rij->opdrachtgever) {
        echo 'selected ';
    }
    echo '" >' . $rij->opdrachtgever . '</option>';
}
?>
                        </select><br /><br />
                        <div class="label">Projectleider:</div>
                        <select class="textbox" name="projectleider" style="width: 226px"><option value=""></option>
<?php 
$results = $project->get_form_users();
echo $results;
?>
                        </select><br><br>
                     
                        <div class="label">Skills toevoegen:</div>
                        <select name="addskill" class="textbox" style="width: 226px"><option value=""></option>
<?php 
$sql = "SELECT skill FROM skills";
$data = DB::getInstance()->query($sql);
foreach ($data->results() as $rij) {
    echo '<option>' . $rij->skill . '</option>';
}
?>
        </select><br/><br>
<div class="label">level:</div>