I'm trying to calculate the sum of an array of decimal values in PHP, but for some reason it keeps rounding to integers.

for example:

```
$oldArray = array(0.00,1000.11,988.92,978.22,964.01,953.07,948.82,917.26,902.56,913.21,904.08,898.86,892.79);
$myVar = 0.0;
for($k=1;$k<10;$k++)
{
$myVar += $oldArray[$k];
}
print_r($myVar);

```

$oldArray is actually populated with decimal values from an SQL query (the length of $oldarray is about several hundred, but I want the first 10.
In the above example, I'm expecting $myVar to be a decimal, but it turns out to be just an integer. I tried setting $myVar = 0.0000 before the for loop, I tried $myVar += $oldArray[$k] + 0.0000, etc but nothing seems to work.

What am I doing wrong? How do I explicitly set $myVar to be a decimal?