Array and For each Function Not Working - php

Question

Please can someone help me, I am trying to use the array function to give an overall variable a positive or negative value, based on the results of checkboxes.
The checkbox question is, which of the following reindeer exist, so for every reindeer that is correct I am looking to give the variable $finalvalue an increment value. Then leaving an IF function at the end to say if the wrong reindeer is ticked, give a decrement value, but as well as the increment values for the right ones.
I have attached the code below, every time I use it, the value does not increase as desired or is not cumulative for every correct reindeer.
Thanks.
HTML FIRST
Which of the following are of Santa's Reindeer?(You can select more than one answer)<br>
<input type="checkbox" name="reindeer" value="Rudolph">Rudolph<br>
<input type="checkbox" name="reindeer" value="Prancer">Prancer<br>
<input type="checkbox" name="reindeer" value="Dancer">Dancer<br>
<input type="checkbox" name="reindeer" value="Ronald">Ronald<br>
<br><br>
<input type="submit" value="Submit">
PHP SCRIPT RECIEVER SIDE
$reindeer=$_GET['reindeer'];
$type=array("Rudolph","Dancer","Prancer");
foreach($type as $reindeer){$finalvalue = $finalvalue+2;};
if ($reindeer=="Donald"){$finalvalue = $finalvalue-6;}
print "$finalvalue";
Thanks for any help.

Answer 1

<?php
$input = $_GET['reindeer'];
$valid = ["Rudolph","Dancer","Prancer"];
# Debug input..
echo 'Raw input data:<pre>';
var_dump($input);
echo '</pre>';
if(is_array($input)){
foreach($input as $reindeer){
if(in_array($reindeer, $valid)){
echo 'user supplied multiple answers and '.$reindeer.' is listed in $valid. </br>';
$finalvalue = $finalvalue+2;
} else {
echo 'user supplied multiple answers and '.$reindeer.' is listed <strong>not</strong> in $valid. </br>';
$finalvalue = $finalvalue-6;
}
}
} else {
# This code should never execute unless the user changes the html code.
if(in_array($input, $valid)){
echo 'user supplied 1 answer and '.$reindeer.' is listed in $valid. </br>';
$finalvalue = 2;
} else {
echo 'user supplied 1 answer and '.$reindeer.' is listed <strong>not</strong> in $valid. </br>';
$finalvalue = 0;
}
}
echo $finalvalue;
?>

Answer 2

Which of the following are of Santa's Reindeer?(You can select more than one answer)<br>
<input type="checkbox" name="reindeer[]" value="Rudolph">Rudolph<br>
<input type="checkbox" name="reindeer[]" value="Prancer">Prancer<br>
<input type="checkbox" name="reindeer[]" value="Dancer">Dancer<br>
<input type="checkbox" name="reindeer[]" value="Ronald">Ronald<br>
<br><br>
<input type="submit" value="Submit">
$input = $_GET['reindeer'];
$valid = ["Rudolph","Dancer","Prancer"];
foreach($input as $reindeer){
if(in_array($reindeer, $valid)){
$finalvalue = $finalvalue+2;
} else {
$finalvalue = $finalvalue-6;
}
}
Notice the brackets in the html. Adding those brackets to the name of the input makes it come as an array. Thus, produces much cleaner and minimal code.