How can developers simplify the process of performing arithmetic operations in PHP without the need for complex class structures?

Developers can simplify the process of performing arithmetic operations in PHP by using built-in functions like `+`, `-`, `*`, `/`, and `%` instead of creating complex class structures. These operators can handle basic arithmetic operations efficiently without the need for additional code.

// Perform arithmetic operations using built-in operators
$sum = 10 + 5;
$difference = 10 - 5;
$product = 10 * 5;
$quotient = 10 / 5;
$remainder = 10 % 5;

echo "Sum: $sum, Difference: $difference, Product: $product, Quotient: $quotient, Remainder: $remainder";