R Rati Dubey 🎓 Tutor III ⭐ 8.55K Points 📊 PHP Q. Which function is used to check if a variable is set in PHP? (A) isset() (B) isnull() (C) exists() (D) defined() 👁️ Show Answer 💬 Discuss 🔗 Share ⚡Menu ✅ Correct Answer: (A) isset() Explanation: isset() checks whether a variable is set and not null.