How can error_reporting and require_once be used to improve PHP script development?

When developing PHP scripts, it is important to handle errors effectively and ensure that required files are included only once to avoid conflicts. By setting error_reporting to display all errors and using require_once to include files, developers can easily identify and fix issues in their code, leading to more efficient script development.

// Set error reporting to display all errors
error_reporting(E_ALL);

// Include a file only once using require_once
require_once 'config.php';