How can developers effectively troubleshoot PHP code errors in PHP 7.x that were previously not thrown in PHP 5.x?

In PHP 7.x, errors that were previously not thrown in PHP 5.x may be related to stricter type checking and error handling. Developers can effectively troubleshoot these errors by reviewing the PHP documentation for changes between versions, using debugging tools like Xdebug, and testing their code in a development environment before deploying it to production.

// Example PHP code snippet demonstrating how to fix a type error in PHP 7.x that was not thrown in PHP 5.x

// PHP 5.x code
function addNumbers($num1, $num2) {
    return $num1 + $num2;
}

// PHP 7.x code with stricter type checking
function addNumbers(int $num1, int $num2) {
    return $num1 + $num2;
}