Why is the file not included?

Question

PHP

Good afternoon, I have a problem with connecting a file with a class.
I made a simple SEF link system:

session_start();
$uri = trim(preg_replace('#(\?.*)?#', '', $_SERVER['REQUEST_URI']), '/');
if (gettype($uri) !== "string") {
    die;
}

switch ($uri) {
    case '':
        include 'templates/main.php';
        break;
}

As you can see, here, depending on the uri, the desired page is connected.
On this page, there is such a code that includes a file with a class and calls the desired method.

include 'lib/Function.php';
$func = new Function;
$one = $func->print();
echo $one;

The class itself contains this code:

class Function
{
    public function print() {
        $one = 1;
        return $one;
    }
}

As a result, the page that should be displayed in the right path does not work for me. (Page not available, error 500).
Please help me to deal with this problem.

Answer 1

error 500 is a general error, that is, in fact, there can be any error, but since you have suppressed error output, a general error is given - 500. See the logs, or turn on error output to get a real error.