What is the potential issue with the code provided in the forum thread related to the output of the navigation function?

The potential issue with the code is that the navigation function is not returning the correct output due to a missing return statement. To solve this issue, we need to add a return statement to the navigation function to ensure that it returns the correct output.

function navigation() {
    // Navigation logic here
    $output = "Navigation menu items";
    
    return $output; // Add a return statement to return the output
}

// Call the navigation function
echo navigation();