How important is project documentation in maintaining and managing a PHP project with a large number of files and tables?

Project documentation is crucial in maintaining and managing a PHP project with a large number of files and tables. It helps developers understand the project structure, functionality, and relationships between different components. Proper documentation also aids in onboarding new team members, troubleshooting issues, and ensuring consistency in coding practices.

/**
 * This function calculates the sum of two numbers
 * 
 * @param int $num1 The first number
 * @param int $num2 The second number
 * @return int The sum of the two numbers
 */
function calculateSum($num1, $num2) {
    return $num1 + $num2;
}