Which of following functions compute the intersection of arrays with additional index check and are defined newly in PHP5?

class B { public $b; } function process_a($a) { $a['b'] = 42; } function process_b($b) { $b->b = 42; } $v1 = array('b' => 2); process_a($v1); $v2 = new B(); $v2->b = 2; process_b($v2); What are the values of $v1['b'] and $v2->b?

When passing an undefined variable to a function by reference, e.g. function test(&$var) { /* ... */ } unset($x); test($x); What is the error message?

How do I extend an interface?

What should you do to prevent error while unserializing serialized object of non-existent class?

When an object is serialized, which method will be called, automatically, providing your object with an opportunity to close any resources or otherwise prepare to be serialized?

You have two strings, you want to concatenate. $str1 = 'Have a '; $str2 = 'Nice Day'; The fastest way would be:

What will be the output? $a = 10; if($a > 5 OR < 15) echo 'true'; else echo 'false'

Which PHP syntax depictions is/are incorrect?

Output of the code? $var = 10; function fn() { $var = 20; return $var; } fn(); echo $var;

Which is an iterator class included in Standard PHP Library (SPL) in PHP5?