HTML

<form action=”<?php echo $_SERVER[‘PHP_SELF’]; ?>” method=”post”>
<select name=”test[]” multiple=”multiple”>
    <option value=”one”>one</option>
    <option value=”two”>two</option>
    <option value=”three”>three</option>
    <option value=”four”>four</option>
    <option value=”five”>five</option>
</select>
<input type=”submit” value=”Send” />
</form>

PHP

<?php
    $test=$_POST[‘test’];
    if ($test){
        foreach ($test as $t){echo ‘You selected ‘,$t,'<br />’;}
    }
?>