php面试题_雅虎.doc

【公司面试题之：Yahoo! PHP 笔试题】1. Which of the following will not add john to the users array? 复制内容到剪贴板 代码:1. $users = john;2. array_add($users,john);3. array_push($users,john);4. $users |= john;2. Whats the difference between sort(), asort() and ksort? Under what circumstances would you use each of these?3. What would the following code print to the browser? Why? 复制内容到剪贴板 代码: $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? Whats 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”?11. How do you access and set properties of a class from within the class?12. What is the difference between include & include_once? include & require?13. What function would you use to redirect the browser to a new page? 复制内容到剪贴板 代码: 1. redir() 2. header() 3. location() 4. redirect()14. What function can you use to open a file for reading and writing? 复制内容到剪贴板 代码: 1. fget(); 2. file_open(); 3. fopen(); 4. open_file();15. Whats the difference between mysql_fetch_row() and mysql_fetch_array()?16. What does the following code do? Explain whats going on there. 复制内容到剪贴板 代码: $date=08/26/2003; print ereg_replace(“(0-9+)/(0-9+)/(0-9+)”,2/1/3,$date);17. Given a line of text $string, how would you write a regular expression to strip all the HTML tags from it?18. Whats the difference between the way PHP and Perl distinguish between arrays and hashes?19. How can you get round the stateless nature of HTTP using PHP?20. What does the GD library do?21