Stop PHP from rounding my numbers

i've created a invoice creator but it keeps rounding my numbers how do i stop this.

You see at stukprijs = 206,61 and total is 206 total needs to be 206,61 aswell.

code:

public function makepdf(Request $request){
    $data = $request->all();

    $data['totaal1'] = $data['stukprijs1'] * $data['aantal1'];

i sent the values from a form field with post

the app is build in laravel

thanks in advance

via Chebli Mohamed