if (!filter_var($email, FILTER_VALIDATE_EMAIL)) { $error = “Invalid email format”; }
if ($password !== $confirm_password) { $error = “Passwords do not match”; }
if (!in_array($file_extension, $allowed_extensions)) { $error = “Invalid file format”; }Package library: File Management Library Overall, PHP offers user error handling functions that can easily detect and display appropriate error messages to users. Depending on the need, developers can use various package libraries to handle different types of user errors.