How can the readability and maintainability of PHP code be improved by separating potential error sources in functions?

By separating potential error sources into functions, the readability and maintainability of PHP code can be improved by encapsulating error-handling logic in specific functions. This approach can make the main codebase cleaner and easier to understand, as error handling is abstracted into separate functions. Additionally, this separation allows for easier debugging and maintenance as errors can be isolated and addressed more efficiently.

function fetchData($url) {
    // Fetch data from URL
    $data = file_get_contents($url);

    if ($data === false) {
        handleError('Error fetching data from URL');
    }

    return $data;
}

function handleError($message) {
    // Log error message or handle error in a specific way
    error_log($message);
    // Additional error handling logic can be added here
}