Yahoo is said to be a PHP face questions with answers _php tips

Collected from the Internet, is said to be Yahoo's face test questions.
1. Which of the following won't add John to the users array?
1. $users [] = ' John ';
2. Array_add ($users, ' John '); Wrong
3. Array_push ($users, ' John ');
4. $users | | = ' John '; Wrong
2. What ' s The difference between sort (), Asort () and Ksort? Under what circumstances would you with each of these?
My An:sort ()-Sort asort ()-keep key value sorted Ksort ()-Sorted in key order Rsort ()-Reverse sort arsort ()-keep key value inverse sort krsort ()-Sort in reverse order of key
3. What would the following code print to the browser? Why?
$num = 10;
function Multiply ()
{
$num = $num * 10;
}
Multiply ();
Echo $num;
My an:10 because Var scope4. What is the difference between a reference and a regular variable? How does your pass by reference & why would your want to?
5. What functions can you add library code to the currently running script?
6. What is the difference between foo () & @foo ()?
7. How did you debug a PHP application?
8. What does = = do? What ' s a example of something that would give true for ' = = ', but not ' = = '?
9. How would your declare a class named "MyClass" with no methods or properties?
How would are you to create an object, which be an instance of "MyClass"?
How did you access and set properties of a class from within the class?
What is the difference between include & Include_once? Include & require?
What function would you with the redirect the browser to a new page?
1. Redir () 2. Header () 3. Location () 4. Redirect ()
My An:2
What function can you with to open a file for reading and writing?
1. Fget (); 2. File_open (); 3. fopen (); 4. Open_file (); my an:315. What ' s The difference between mysql_fetch_row () and mysql_fetch_array ()?
What does the following code do? Explain what ' s going on there.
$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 your write a regular expression to strip all the HTML tags from it?
What ' s The difference between the way PHP and Perl distinguish between arrays and hashes?
How can I/round the stateless nature of HTTP using PHP?
What does the GD library do?
Name a few ways to output (print) A blocks of HTML code in PHP?
is PHP better than Perl? –discuss.