Exercises

1. What will the following function call return: is_readable("http://www.slashdot.org")

2. Which function locks files:

   • a) lock()

   • b) lockf()

   • c) flock()

   • d) file_lock()

3. What is the primary difference between rename() and move_uploaded_file()?

4. In the .ini file format, what is considered to be the start of a comment?

   • a) //

   • b) #

   • c) ;

   • d) All of the above

5. Which superglobal array contains information on uploaded files?

   • a) $_GET

   • b) $_POST

   • c) $_REQUEST

   • d) None of the above

6. Under what circumstances can the file_exists() function report incorrect data?

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