Zend Exam 200-710 Topic 2 Question 42 Discussion

Actual exam question for Zend's 200-710 exam

Question #: 42
Topic #: 2

[All 200-710 Questions]

What is the output of the following code?

class a

{

public $val;

}

function renderVal (a $a)

{

if ($a) {

echo $a->val;

}

renderVal (null);

AA syntax error in the function declaration line

BAn error, because null is not an instance of 'a'

CNothing, because a null value is being passed to renderVal()

DNULL

Show Suggested Answer

Suggested Answer: A

by Johnetta at Jan 05, 2023, 03:52 PM

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Benedict

1 months ago

Wait, is this a trick question? What if the real answer is 'a syntax error, and then a crash and burn of the entire system'? Hmm, maybe I should just guess randomly.

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Adolph

2 days ago

C) Nothing, because a null value is being passed to renderVal()

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Clay

8 days ago

I think it's B

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Deangelo

17 days ago

B) An error, because null is not an instance of 'a'

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Layla

1 months ago

This question is a real head-scratcher. I'm gonna go with option B, just because I don't trust passing null values to functions.

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Giovanna

1 months ago

Hold up, why is the function declaration using 'a $a' instead of just '$a'? Isn't that a syntax error? I'm gonna go with option A.

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Ivette

1 days ago

Got it, thanks for the explanation!

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Ressie

8 days ago

Oh, I see. So, since null is not an instance of 'a', it will result in an error. Option B is correct.

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Anjelica

16 days ago

It's not a syntax error, it's type hinting for the parameter. So, the function expects an object of class 'a'.

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Lynette

2 months ago

Ugh, I hate these tricky questions. But I think option C is the right answer. The function will just do nothing if a null value is passed in.

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Phillip

9 days ago

Yeah, the function won't do anything with a null value.

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Estrella

22 days ago

I agree, passing a null value will result in nothing happening.

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Lisha

1 months ago

I think option C is correct.

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Colby

2 months ago

Hmm, I'm going with option D. The function is checking if the $a parameter is truthy, and null is a falsy value, so it should output NULL.

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Tamar

3 days ago

You're right, null is falsy so it should output NULL.

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Teddy

17 days ago

Actually, I believe it will output NULL.

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Nelida

18 days ago

I agree, it should throw an error.

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Aleshia

1 months ago

I think it's option B. Null is not an instance of 'a'.

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Tanja

2 months ago

I'm pretty sure option B is the correct answer. Passing a null value to a function that expects an instance of a class will result in an error.

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Carman

2 months ago

I agree with Arlene, it should be an error.

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Arlene

2 months ago

I believe it's an error, because null is not an instance of 'a'.

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Kaitlyn

2 months ago

I think the output is NULL.

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