mySQL i php u DRW mx

Code:

<form action="" method="post" name="form1">
     <p>
         <input name="vred_a" type="text" id="vred_a">
     </p>
        <p>Unesi B </p>
        <p>
          <input name="vred_b" type="text" id="vred_b"> 
        </p> 
        <?php
                        $vr_a = "FORM1.vred_a";
                $vr_b = "FORM1.vred_b";
                
                function Suma(){
                 $GLOBALS["vr_s"] = $GLOBALS["vr_a"]+ $GLOBALS["vr_b"];
                 }
                 Suma();
                  $_POST ['vr_s'];
            ?> 
        <p>
          <input type="submit" name="Submit" value="Submit"> 
        </p>
      </form>

Code:

<?php

function sum($x, $y)
{
     $z = $x + $y;
     return($z);
}

$vred_a = $_GET['vred_a'];
$vred_b = $_GET['vred_b'];

print sum($vred_a, $vred_b);

?>