PHP and Zend Framework Certifications 200-550 Dumps PDF

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);

Which of the following PHP functions can be used to set the HTTP response code? (Choose 2)

What will be the result of the following operation?

$a = array_merge([1,2,3] + [4=>1,5,6]);

echo $a[2];

What is the output of the following code?

var_dump(boolval([]));