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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);

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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Adelina

11 months ago

Wait, are you sure it won't cause an error?

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Estrella

11 months ago

I agree, it should just output nothing.

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Janessa

11 months ago

Passing null means it just outputs nothing, right?

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Kristel

11 months ago

I think it will throw an error for passing null.

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Rozella

11 months ago

It's definitely not a syntax error.

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Emmett

12 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

12 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

12 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

12 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

12 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

12 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

1 year 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

1 year 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 year ago

I'm going with C

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Adolph

1 year ago

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

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Clay

1 year ago

I think it's B

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Deangelo

1 year ago

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

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Layla

1 year 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

1 year ago

Got it, thanks for the explanation!

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Ressie

1 year 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

1 year 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

1 year ago

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

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Estrella

1 year 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

1 year ago

So, the answer is NULL then.

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Geoffrey

1 year ago

I agree, the function won't echo anything with a null value.

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Jenelle

1 year ago

Yeah, NULL seems like the correct output.

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Hollis

1 year ago

I think it's option D too.

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Tamar

1 year ago

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

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Teddy

1 year ago

Actually, I believe it will output NULL.

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Nelida

1 year ago

I agree, it should throw an error.

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Aleshia

1 year 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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