R Rati Dubey 🎓 Tutor III ⭐ 8.55K Points 📊 PHP Q. Which function can be used to include code only once? (A) include() (B) require_once() (C) require() (D) include_once() 👁️ Show Answer 💬 Discuss 🔗 Share ⚡Menu ✅ Correct Answer: (D) include_once() Explanation: include_once() includes the file only once and avoids redeclaration errors.