sizes=, , <br><form method=POST action="checkbox.php">
Select Beer Can sizes:
<input type=checkbox name=sizes[] value="12oz"> 12 oz.<br>
<input type=checkbox name=sizes[] value="16oz"> 16 oz.<br>
<input type=checkbox name=sizes[] value="22oz"> 22 oz.<br>
<br><br>
<input type=submit>
</form>