explode strings to get numbers and do calculation?

[StefanRSA]

I am getting numbers from a string and my code look like:

foreach ($gresult as $x ){
  if(!empty($x)){
$unit_result= explode(",",$x);
$price = $unit_result[6];

echo $price;
}
}

$price can contain 3000 and 1500 but if I echo it gives me 30001500.

How can I ad $price to give me the total? (Like 3000 + 1500 = 4500)

In other words. I just want the sum of $price.

 

Can anybody help me out here please?

[Mchl]

$sum = 0;
foreach ($gresult as $x ){
  if(!empty($x)){
    $unit_result= explode(",",$x);
      $price = $unit_result[6];
      $sum += $price;
}
}
echo $sum;

 

[StefanRSA]

TY Mchl!