Given the following code, what is correct?
```php
function f(stdClass &$x = NULL) { $x = 42; }
$z = new stdClass;
f($z);
var_dump($z);
```

Question

Accepted Answer

E. Result is 42

Answer

A. Error: Typehints cannot be NULL

Answer

B. Error: Typehints cannot be references

Answer

C. Result is NULL

Answer

D. Result is object of type stdClass

Given the following code, what is correct? ``php function f(stdClass &$x = NULL) { $x = 42; } $z = new stdClass; f($z); var_dump($z); ``