4.25     Exercises

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1. To delete a variable, what function do you use:

   • a) delete()

   • b) unset()

   • c) deset()

   • d) remove()

2. To uppercase the first letter in a string, what function do you use:

   • a) str_to_upper()

   • b) str_to_upper_first()

   • c) uc_first()

   • d) ucfirst()

3. What does the dl() function do, and what is the major disadvantage to using it?

4. Which of the following statements are true about recursive functions:

   • a) They call themselves

   • b) They need to be inside loops

   • c) They need to be registered with PHP

   • d) They must return a value

5. Regular expressions should be used whenever possible : true or false?

6. You always need to use addslashes() on variables before inserting them into a database: true or false?

7. Using register_shutdown_function(), you can register as many shutdown functions as you want: true or false?