1. What is PHP used for? 2. What is an array and its types? 3. What are the types of errors in PHP? 4. What is Ajax? 5. What is MySQL and basic SQL queries. 6. What is the Difference between implode and explode? 7. Tell me 5 string and 5 array functions in PHP. 8. What is the difference between include and require in PHP. 9. what is jQuery and give some examples of events. 10. Give some examples of jquery selectors.