Q. What does isset() function do? (A) Checks if a variable is empty (B) Checks if a variable is set and not null (C) Checks the data type (D) Deletes a variable 👁️ Show Answer 💬 Discuss 🔗 Share ⚡Menu ✅ Correct Answer: (B) Checks if a variable is set and not null Explanation: isset() checks whether a variable is set and is not NULL.