http://stackoverflow.com/questions/12907283/multiple-checkbox-options-on-a-php-form
<label class="radio"><input type="checkbox" name="service[]" value="Web Design" />Web Design</label>
<label class="radio"><input type="checkbox" name="service[]" value="Graphic Design" />Graphic Design</label>
<label class="radio"><input type="checkbox" name="service[]" value="Brand Identity" />Brand Identity</label>
<label class="radio"><input type="checkbox" name="service[]" value="Online Marketing" />Online Marketing</label>
<label class="radio"><input type="checkbox" name="service[]" value="Other" />Other</label>
print_r($_POST['service']);
// output
Array
(
[0] => Web Design
[1] => Graphic Design
[2]
=> Brand Identity
[3] => Online Marketing
[4] => Other
)