What steps can be taken to ensure that variables in PHP scripts have the correct data type to prevent errors like the one mentioned in the thread?

To ensure that variables in PHP scripts have the correct data type, you can use type declarations in function parameters or explicitly cast variables to the desired type. This helps prevent errors like trying to perform arithmetic operations on a string, as mentioned in the thread.

// Example of using type declarations in function parameters
function calculateSum(int $num1, int $num2) {
    return $num1 + $num2;
}

// Example of explicitly casting a variable to a specific type
$number = "10";
$number = (int) $number;
echo $number; // Output: 10