PHP和Phpmyadmin乘法

I want to hit 2 values with the same id on PhpMyAdmin. According to the codes below, only the aggregation is running in the outputs I receive. I get a value of 0 when I multiply instead of adding.

<?php 

$a = 0; 

$oran = new sorgu; 
$k_id = $kuponlar->veri->id; 

$oran->select("*","matches","kid=$k_id"); 
while($oran->verioku()){
    $a =  $a+ floatval($oran->veri->oran);
}

echo $a; 

?>

Screenshots:

It is necessary to multiply the "oran" values in there. But those with the same "kid" value are at least struck for that table.

That's the code that's running

Action Required:

1,25 x 1,5 x 1,3 x 1,55