Array of select values - php

Question

So basically, I have an array of Modules and I want to have a drop-down menue that users can then select what grade they got. This works fine, however, I would like the results to be stored inside of an array, to however many values they selected. So for example:
If someone selected "40" in Mod1 and in Mod2 they selected "20" then the array would be like this:
mod1=>40
mod2=>20
...
Here is the code so far, it's probably something stupid, I just cannot get my head around it.
<?php
$modules = array('Mod1', 'Mod2', 'Mod3');
if(!isset($_POST['submitted']))
{
echo '<form method="post">';
echo 'Please enter the grades you got for each Module: <br />';
foreach($modules as $module)
{
echo $module . ': <input type="text" name="grades[]" value=""> <br />';
}
echo '<br /><input type="submit" name="submit" value="Go!">';
echo '<input type="hidden" name="submitted" value="TRUE">';
}else{
$input = $_POST['score[]'];
foreach($modules as $i => $module){
$input[$module] = $input[$i];
var_dump($input[$module] = $i);
//unset($input[$i]);
}
//var_dump($input);
}
?>

Answer 1

<select name="score[<?php echo $module; ?>]">
should get you going :)
the array will look exactly like you narrowed it down in the intro.

Answer 2

You could use a name that groups the values of the selects in POST into one array:
echo '<select name="score[]">';
You can then use:
$input = $_POST['score[]'];
foreach($modules as $i=>$module){
$input[$module] = $input[$i];
unset($input[$i]);
}
var_dump($input);

Answer 3

just change your name attribute to an array:
echo '<select name="score[]">';
the the $_POST variable will be in an array