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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);

Show Suggested Answer Hide Answer
Suggested Answer: A

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

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Benedict
2 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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Garry
1 months ago
I'm going with C
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Adolph
1 months ago
C) Nothing, because a null value is being passed to renderVal()
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Clay
1 months ago
I think it's B
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Deangelo
2 months ago
B) An error, because null is not an instance of 'a'
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Layla
2 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
2 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 months ago
Got it, thanks for the explanation!
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Ressie
1 months 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
2 months 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
3 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
1 months ago
Yeah, the function won't do anything with a null value.
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Estrella
2 months ago
I agree, passing a null value will result in nothing happening.
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Lisha
2 months ago
I think option C is correct.
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Colby
3 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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Brock
25 days ago
So, the answer is NULL then.
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Geoffrey
26 days ago
I agree, the function won't echo anything with a null value.
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Jenelle
27 days ago
Yeah, NULL seems like the correct output.
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Hollis
30 days ago
I think it's option D too.
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Tamar
1 months ago
You're right, null is falsy so it should output NULL.
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Teddy
2 months ago
Actually, I believe it will output NULL.
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Nelida
2 months ago
I agree, it should throw an error.
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Aleshia
2 months ago
I think it's option B. Null is not an instance of 'a'.
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Tanja
3 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
3 months ago
I agree with Arlene, it should be an error.
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Arlene
3 months ago
I believe it's an error, because null is not an instance of 'a'.
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Kaitlyn
3 months ago
I think the output is NULL.
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