php interview questions and answers for two year experienced 1Q: What is the difference between the functions unlink and unset? Ans: unlink() deletes the given file from the file system. unset() makes a variable undefined. 2Q: How many ways we can pass the variable through the navigation between the pages? Ans: GET, QueryString, POST 3Q: How can we know the count/number of elements of an array? Ans: 2 ways a) sizeof($urarray) This function is an alias of count() b) count($urarray) 4Q: How can we convert the time zones using PHP? Ans: date_default_timezone_set('Asia/Tokyo'); 5Q: How many ways can we get the value of current session id? Ans: session_id() returns the session id for the current session. 6Q: How can we destroy the session, how can we unset the variable of a session? Ans: session_unregister — Unregister a global variable from the current session session_unset — Free all session variables.