A friend recently got some pre-interview questions from YAHOO for a PHP job. Following up my previous post about programmer questions I thought I would post them to give people examples of what a large corporation like YAHOO asks.
1. Which of the following will not add john to the users array?
1. $users[] = ‘john’;
2. array_add($users,’john’);
3. array_push($users,‘john’);
4. $users ||= ‘john’;
2. What’s the difference between sort(), assort() and ksort? Under what circumstances would you use each of these?
3. What would the following code print to the browser? Why?
$num = 10;
function multiply(){
$num = $num * 10;
}
multiply();
echo$num;
4. What is the difference between a reference and a regular variable? How do you pass by reference & why would you want to?
5. What functions can you use to add library code to the currently running script?
6. What is the difference between foo() & @foo()?
7. How do you debug a PHP application?
8. What does === do? What’s an example of something that will give true for ‘==’, but not ‘===’?
9. How would you declare a class named “myclass” with no methods or properties?
10. How would you create an object, which is an instance of “myclass”?