Workshop

The workshop is designed to help you anticipate possible questions, review what you've learned, and begin putting your knowledge into practice.

Quiz

1:	True or false: If a function doesn't require an argument, you can omit the parentheses in the function call.
A1:	The statement is false. You must always include the parentheses in your function calls, whether you are passing arguments to the function or not.
2:	How do you return a value from a function?
A2:	You must use the return keyword.
3:	What would the following code fragment print to the browser? $number = 50; function tenTimes() { $number = $number * 10; } tenTimes(); print $number;
A3:	It would print 50. The tenTimes() function has no access to the global $number variable. When it is called, it will manipulate its own local $number variable.
4:	What would the following code fragment print to the browser? $number = 50; function tenTimes() { global $number; $number = $number * 10; } tenTimes(); print $number;
A4:	It would print 500. We have used the global statement, which gives the tenTimes() function access to the $number variable.
5:	What would the following code fragment print to the browser? $number = 50; function tenTimes( &$n ) { $n = $n * 10; } tenTimes($number); print $number;
A5:	It would print 500. By adding the ampersand to the parameter variable $n, we ensure that this argument is passed by reference. $n and $number point to the same value, so any changes to $n will be reflected when you access $number.

Activity

Create a function that accepts four string variables and returns a string that contains an HTML table element, enclosing each of the variables in its own cell.