If you are attending a job interview for a PHP position, you will do well to read Matt Wilkin's answers to some of the most commonly asked questions. In a two parter series, Matt has provided anwers to queries such as:

• Which of the following will NOT add john to the users array?
• What’s the difference between sort(), assort() and ksort? Under what circumstances would you use each of these?
• What is the difference between a reference and a regular variable? How do you pass by reference and why would you want to?
• What functions can you use to add library code to the currently running script?
• What is the difference between foo() & @foo()?
• How do you debug a PHP application?
• What does === do? What’s an example of something that will give true for ‘==’, but not ‘===’?
• How would you declare a class named “myclass” with no methods or properties?
• How would you create an object, which is an instance of “myclass”?
• How do you access and set properties of a class from within the class?
• What is the difference between include, include_once? and require?
• What function would you use to redirect the browser to a new page?
• What function would you use to redirect the browser to a new page?
• What's the difference between mysql_fetch_row() and mysql_fetch_array()?
• Given a line of text , how would you 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 you get round the stateless nature of HTTP using PHP?
• What does the GD library do?
• Name a few ways to output (print) a block of HTML code in PHP?
• Is PHP better than Perl? - Discuss.