Multi select PHP

Answer 1

Firstly, $test should be assigned using a ternary operator, that way we can make sure we don't cause PHP Warnings.

$test = isset($_POST['test']) ? $_POST['test'] : false;
if($test):
    //good
endif;

Secondly, why even bother using string interpretation of an integer?

one //note the values
two

Lets make an array that has our answers.

$vals = array(
    0 => 'Not an option!',
    1 => 12,
    2 => 2,
    3 => 14,
    4 => 26
);

Create a dummy variable we can use to concatenate the values posted.

$val = 0;

foreach($test as $t):
    $val += $t;
endforeach;

Now $t will be the value of all the posted select items.

echo $vals[$val];

And that simple echo statement will supply you with your answer. This way you're not having to do multiple if/else statements, keeps it cleaner and more robust imo.

and here's a Codepad illustrating this