What will isset() return in the following code? $search_array = array('first' => null, 'second' => 4); isset($search_array['first']);

In what version of PHP were namespaces added?

What does php_strip_whitespace function return?

Which function 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?

Which is a PHP resource?

Does PHP 5 support exceptions?

Which characters are taken care of by htmlspecialchars?

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'