Yahoo的PHP面試題

　　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”?

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