A Admin 🎓 Coach ⭐ 38.03K Points 📊 PHP Q. Which PHP function checks if a variable is set and not NULL? (A) is_set() (B) isset() (C) check() (D) notnull() 👁️ Show Answer 💬 Discuss 🔗 Share ⚡Menu ✅ Correct Answer: (B) isset() Explanation: isset() checks if a variable is set and not NULL.