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Zend 200-710 Exam - 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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Adelina
6 months ago
Wait, are you sure it won't cause an error?
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Estrella
6 months ago
I agree, it should just output nothing.
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Janessa
7 months ago
Passing null means it just outputs nothing, right?
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Kristel
7 months ago
I think it will throw an error for passing null.
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Rozella
7 months ago
It's definitely not a syntax error.
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Emmett
7 months ago
I’m a bit confused about the output. I thought it would just return NULL, but I can't recall if that's the same as outputting nothing. Maybe option D?
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Jamal
7 months ago
I feel like the function just checks if $a is truthy, so maybe it just outputs nothing if null is passed? That makes me think of option C.
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Jade
7 months ago
I think I practiced a similar question where passing null to a function expecting an object caused an error. So, I might lean towards option B.
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Pedro
7 months ago
I remember something about how passing null to a function can lead to errors, but I'm not sure if it's a syntax error or a type error.
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Bette
7 months ago
Okay, this is a good question. I'm pretty confident that Workforce Management is the right answer here. It's designed to help manage and automate agent scheduling, which is exactly what the problem is describing.
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Felton
7 months ago
This is a tricky one. I could see the appeal of just giving the students a list of links or printed web pages, but that doesn't really develop their research abilities. I think the key is to guide them through the process rather than just handing them the information.
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Shawna
7 months ago
Hmm, I'm a bit confused on the authentication binding points here. Let me re-read the question carefully and see if I can work this out.
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Benedict
12 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
11 months ago
I'm going with C
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Adolph
11 months ago
C) Nothing, because a null value is being passed to renderVal()
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Clay
11 months ago
I think it's B
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Deangelo
11 months ago
B) An error, because null is not an instance of 'a'
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Layla
12 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 year 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
11 months ago
Got it, thanks for the explanation!
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Ressie
11 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
11 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
1 year 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
11 months ago
Yeah, the function won't do anything with a null value.
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Estrella
12 months ago
I agree, passing a null value will result in nothing happening.
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Lisha
1 year ago
I think option C is correct.
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Colby
1 year 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
11 months ago
So, the answer is NULL then.
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Geoffrey
11 months ago
I agree, the function won't echo anything with a null value.
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Jenelle
11 months ago
Yeah, NULL seems like the correct output.
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Hollis
11 months ago
I think it's option D too.
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Tamar
11 months ago
You're right, null is falsy so it should output NULL.
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Teddy
11 months ago
Actually, I believe it will output NULL.
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Nelida
11 months ago
I agree, it should throw an error.
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Aleshia
12 months ago
I think it's option B. Null is not an instance of 'a'.
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Tanja
1 year 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
1 year ago
I agree with Arlene, it should be an error.
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Arlene
1 year ago
I believe it's an error, because null is not an instance of 'a'.
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Kaitlyn
1 year ago
I think the output is NULL.
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