Question No. 1 (Marks 1) What is the difference between a double quoted and a single quoted string in PHP? Briefly describe Question No. 2 (Marks 1) Explain the difference between a heredoc and nowdoc. Question No. 3 (Marks 1) Explain the purpose of htmlentities function in PHP. Question No. 4 (Marks 1) How do we use implode and explode functions for strings? Question No. 5 (Marks 1) What are two different ways to convert a string into a number? Give examples