How can error messages be effectively enabled and handled in PHP code?

To effectively enable and handle error messages in PHP code, you can set the error reporting level using the error_reporting function to display all types of errors, including notices, warnings, and fatal errors. Additionally, you can use the set_error_handler function to define a custom error handler function that will be called whenever an error occurs in your code.

// Enable displaying all types of errors
error_reporting(E_ALL);

// Custom error handler function
function customErrorHandler($errno, $errstr, $errfile, $errline) {
    echo "Error: [$errno] $errstr - $errfile:$errline";
    // Handle the error as needed
}

// Set the custom error handler
set_error_handler("customErrorHandler");