200-550 Exam Dumps : Zend Certified PHP Engineer

In order to create an object storage where each object would be stored only once, you may use which of the following? (Choose 2)

What is the output of the following code?

function z($x) {

return function ($y) use ($x) {

return str_repeat($y, $x);

};

}

$a = z(2);

$b = z(3);

echo $a(3) . $b(2);

What is the name of the header used to require HTTP authentication?