What is the main issue with the PHP function "spielart" not being called in the provided code snippet?

The main issue with the PHP function "spielart" not being called in the provided code snippet is that the function is defined but not actually invoked anywhere in the code. To solve this issue, you need to call the "spielart" function somewhere in your code where you want its functionality to be executed.

<?php

function spielart() {
    // Function logic here
    echo "This is the spielart function.";
}

// Call the spielart function to execute its logic
spielart();

?>