Why is it important to define and assign values to variables like $ho before using them in calculations?

It is important to define and assign values to variables before using them in calculations because uninitialized variables can lead to unexpected behavior in your code. If you try to perform calculations on a variable that has not been assigned a value, it may result in errors or incorrect results. By defining and assigning values to variables before using them, you ensure that your calculations are based on the correct data.

$ho = 10; // Define and assign a value to the variable $ho before using it in calculations
$calculation = $ho * 2; // Perform a calculation using the variable $ho
echo $calculation; // Output the result of the calculation