Interview Questions in PHP and MySQL -3

1. what is scandir() ?
2. What function would you use to redirect the browser to a new page?
3. What function can you use to open a file for reading and writing?
4. How can you get round the stateless nature of HTTP using PHP?
5. What would the following code print to the browser? Why?
6. What are the different functions in sorting an array?
7. How can we know the number of elements in an array using php?