R Rati Dubey 🎓 Tutor III ⭐ 8.55K Points 📊 PHP Q. Which function is used to include a file only once? (A) include() (B) require() (C) include_once() (D) require_file() 👁️ Show Answer 💬 Discuss 🔗 Share ⚡Menu ✅ Correct Answer: (C) include_once() Explanation: include_once() ensures the file is included only once.