K Kanak Sharma 🎓 Tutor III ⭐ 5.92K Points 📊 PHP Q. Which PHP function checks if a string contains only digits? (A) is_numeric() (B) ctype_digit() (C) preg_digit() (D) is_int() 👁️ Show Answer 💬 Discuss 🔗 Share ⚡Menu ✅ Correct Answer: (B) ctype_digit() Explanation: ctype_digit() checks for digits only (0–9).