What are the common mistakes made when handling PHP includes and function calls, and how can they be avoided?

Common mistakes when handling PHP includes and function calls include using incorrect file paths, forgetting to include necessary files, and not passing the correct arguments to functions. To avoid these mistakes, always double-check file paths, ensure all required files are included, and pass the correct arguments to functions.

// Incorrect file path
include 'utils/functions.php';

// Corrected file path
include 'includes/utils/functions.php';