Exercises

To delete a variable, what function do you use:
- a) delete()
- b) unset()
- c) deset()
- d) remove()
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()
What does the dl() function do, and what is the major disadvantage to using it?
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
Regular expressions should be used whenever possible : true or false?
You always need to use addslashes() on variables before inserting them into a database: true or false?
Using register_shutdown_function(), you can register as many shutdown functions as you want: true or false?

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