How can PHP beginners avoid common mistakes when manipulating code formatting?

PHP beginners can avoid common mistakes when manipulating code formatting by following consistent formatting conventions, such as using proper indentation, spacing, and naming conventions. They should also avoid mixing tabs and spaces, as this can lead to errors in their code. Additionally, beginners should use tools like linters or IDEs to automatically check and fix formatting issues in their code.

// Example of properly formatted PHP code
function calculateSum($num1, $num2) {
    $sum = $num1 + $num2;
    return $sum;
}