How can PHP handle multiplication between a double and an int to output a double result?

When multiplying a double and an int in PHP, the result will automatically be cast to a double if any of the operands is a double. To ensure that the result is a double, you can explicitly cast one of the operands to a double before performing the multiplication. This will guarantee that the result is also a double.

$double = 3.5;
$int = 2;
$result = (double)$double * $int;
echo $result; // Output: 7.0