variabel probleem

<?php

$naam="Robin De Smet";
$aantal=15;
$bedrag=2.500;

$var1=5;
$var1=(double)$var1;
set type($var1,"double");
?>

<?php
 
$naam="Robin De Smet";
$aantal=15;
$bedrag=2.500;
 
$var1=5;
$var1=(double)$var1;
set type($var1,"double");
?>

$var1=5;
$var1=(double)$var1;
set type($var1,"double");

$var1=5;
$var1=(double)$var1;
set type($var1,"double");