M Mr. Dubey 🎓 Coach ⭐ 102.92K Points 📊 PHP Q. Which PHP function checks if a constant is defined? (A) isset() (B) defined() (C) constant_exists() (D) is_constant() 👁️ Show Answer 💬 Discuss 🔗 Share ⚡Menu ✅ Correct Answer: (B) defined() Explanation: defined() checks whether a constant exists.