it is possible with request method to calculate all numbers?

In this form, here is my code:

<?php
// define variables and set to empty values
$number31=2.000;
$number32=493;
$number33=160;
$number34=333;
$number35=1.667;
$number36=1.667;
$number37=467;
$number38=133;
$number39=333;
$number40=1.333;
$number41=1.333;
$number42=440;
$number43=107;
$number44=333;
$number45=1.000;
$number46=1.000;
$number47=413;
$number48=80;
$number49=333;
$number50=667;
$number51=667;
$number52=387;
$number53=53;
$number54=333;
$number55=333;
$number56=333;
$number57=360;
$number58=27;
$number59=333;
$number60=0;

if ($_SERVER["REQUEST_METHOD"] == "POST")
$number31 = test_input($_POST[""]);

switch ($number31)
case 2.000:
print "<h2>complete all the table!</h2>";
echo "<p>2.000, correct

$number32 = test_input($_POST[""]);

switch ($number32)
case 493:
echo "

$number33 = test_input($_POST[""]);

switch ($number33)
case 160:
echo "

$number34 = test_input($_POST[""]);

switch ($number34) 333, correct

$number35 = test_input($_POST[""]);

switch ($number35) 1.667, correct</p>-
$number36 = test_input($_POST[""]);
switch ($number36) ";
break;




$number37 = test_input($_POST[""]);

switch ($number37) ";
break;



$number38 = test_input($_POST[""]);

switch ($number38)
case 133:
echo "

$number39 = test_input($_POST[""]);

switch ($number39) 333, correct

$number40 = test_input($_POST[""]);

switch ($number40) ";
break;



$number41 = test_input($_POST[""]);

switch ($number41)
case 1.333:
echo "

$number42 = test_input($_POST[""]);

switch ($number42) 440, correct

$number43 = test_input($_POST[""]);

switch ($number43) ";
break;



$number44 = test_input($_POST[""]);

switch ($number44) 333, correct

$number45 = test_input($_POST[""]);

switch ($number45) ";
break;


$number46 = test_input($_POST[""]);

switch ($number46) -<p>1.000, correct

$number47 = test_input($_POST[""]);

switch ($number47) 413, correct

$number48 = test_input($_POST[""]);

switch ($number48) ";
break;



$number49 = test_input($_POST[""]);

switch ($number49) 333, correct

$number50 = test_input($_POST[""]);

switch ($number50) ";
break;


$number51 = test_input($_POST[""]);

switch ($number51) <p>667, correct

$number52 = test_input($_POST[""]);

switch ($number52)
case 387:
echo "

$number53 = test_input($_POST[""]);

switch ($number53) 53, correct

$number54 = test_input($_POST[""]);

switch ($number54) 333, correct

$number55 = test_input($_POST[""]);

switch ($number55)
case 333:
echo "
$number56 = test_input($_POST[""]);

switch ($number56) <p>333, correct
$number57 = test_input($_POST[""]);

switch ($number57)
case 360:
echo "

$number58 = test_input($_POST[""]);

switch ($number58) ";
break;



$number59 = test_input($_POST[""]);

switch ($number59) 333, correct

$number60 = test_input($_POST[""]);

switch ($number60) 0, correct</p>



function test_input($data)
$data = trim($data);
$data = stripslashes($data);
$data = htmlspecialchars($data);
return $data;


?>


I try to make a calculation about loan amortization but I encounter two problems: the page does not appear in the browser but only the code, what may cause? is there a code that it can calculate all
$numbers(subtraction, addition, subtraction, multiplication)?
In more detail I have put 30 $numbers for each one case in order to find out if it is correct, I want to fill in all the numbers, correct to get a confirmation. Thanks in advance.

$numbers

case

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