PHP Test Questions

The Little Guy · September 17, 2012

Thank you for all your feedback It's really helpful, and thanks for spell checking I think I got everyone's suggestions and fixed them!

Well, I have re-worded many of the questions and replaced the "non-beginner" ones with jesirose's suggestion of "find/fix the error" questions and also fill in the blank.

===
The following questions are based on php 5.4.x and lower
===


1. Assuming $var has a value of 0, which statements evaluate to true?
* $var == false
- !isset($var)
- !empty($var)
- $var === false

2. Which of the following does not belong?
- echo "Hello, $first_name";
- echo <<<EOD
	Hello, $first_name
EOD;
* cout << "Hello, $first_name";
- print "Hello, $first_name";

3. Which of the following is a valid variable (not property)?
- var $var = 0;
* $_ = 0;
- $1 = 0;
- $var:int = 0;

4. Which line will throw a syntax error?
<?php
$array = array(1,2,3);
foreach($var in $array){
echo $var;
}
?>
- 1
- 2
* 3
- 4
- 5
- 6


5. Which loop type is intended for arrays?
- do ... while
* foreach
- while
- for

6. What is the correct way to define a function?
- function myFunction(){}
- define function myFunction(){}
- function myFunction():void{}
- $myFunction = function(){};
- Both A and C
* Both A and D

7. What is the incorrect way to define an array?
- $array = array();
- $array = [];
* $array = new Array();
- Both B and C
- All of the above

8. Which of the following methods is meant for variable debugging?
- echo $my_var;
  echo $my_var1;
- echo gettype($my_var);
  echo gettype($my_var1);
* var_dump($my_var, $my_var1);

9. Which of the following is not a valid comment?
* ' This is a comment
- # This is a comment
- /* This is a comment */
- // This is a comment

10. All statements must end with a semi-colon?
* True
- False

11. Blank lines out side of php blocks are fine before printing a header?
- True
* False

12. What is the value of $a on line 10?
<?php
$a = 1;
function add(){
$b = 6;
$a = 5;
$a = $a + $b;
return $a;
}
add();
echo $a;
?>

- 11
- 6
* 1
- 5

13. Fill in the blank:
<?php
______($_GET["year"]){
case 2000:
case 2001:
	echo "2000 or 2001!";
	break;
case 2012:
case 2013:
	echo "2012 or 2013!";
	break;
default:
	echo "Bad Date!";
	break;
}
?>
- if
- define
- while
* switch
- declare

14. What what does a ternary statement look like?
- if($i == 2){
	$color = "red";
  }else{
	$color = "blue"
  }
* $color = $i == 2 ? "red" : "blue";
- if($i == 2)
	$color = "red";
  else
	$color = "blue";

15. What does % (Modulus) do?
- Returns the value after the decimal after division
* Returns the remainder of a value after division
- Just another way to divide two numbers
- Returns the value before the decimal after division

16. What does 3 equal signs mean when comparing values?
* Values must be the same value and same type
- 3 equal signs is an error
- 3 equal signs is the same as 2

17. When php reads functions with functions as parameters it reads:
- From left to right
- From right to left
* From the middle out

18. Comparisons can be passed as parameters to a function?
* True
- False

19. What does "=>" (without the quotes) signify?
- A pointer that points to a method/property in an object
* Assigns a key to its value in an array
- A comparison operator "equal to or greater than"
- Both B and C

20. What does "->" (without the quotes) signify?
* An operator that calls a method/property in an object
- A pointer that points a key to its value from an array
- A comparison operator "greater than zero"
- Both B and C

21. What is the difference between "break" and "continue" within a loop?
- "break" exits a loop and ends execution of the file; "continue" exits a loop and continues file execution
- "break" pauses code execution for a short period; "continue" does not pause code execution
* "break" exits a loop and continues; "continue", continues at the beginning of the loop
- both "break" and "continue" exit a loop and continues the code execution

22. What does "goto" do?
* Allows you to tell php to goto a particular label
- Allows you to tell php to goto a particular line number
- Allows you to tell php to goto a file for execution

23. What is missing?
<?php
$_SESSION["name"] = "Billy Joe";
echo $_SESSION["name"];
?>

- $_SESSION = new Session();
* session_start();
- header("Content-Type: text/html");
- define("$_SESSION", array());

24. Does '"null" == null' evaluate to true or false?
- True
* False

25. How do you escape quotes within quotes?
- echo "<a href=/"http://phpsnips.com/">PHP Snips</a>";
- echo '<a href="http://phpsnips.com">PHP Snips</a>';
* echo "<a href=\"http://phpsnips.com\">PHP Snips</a>";
- echo "<a href="http://phpsnips.com">PHP Snips</a>";

Thanks again!

Jessica · September 17, 2012

I like the new ones you added.

kicken · September 17, 2012

17. When php reads functions with functions as parameters it reads:
- From left to right
- From right to left
* From the middle out

I still don't like that one. It still could be interpreted in either way. Perhaps a better phrased question would be "In what order are nested function calls evaluated?" with just two options "Inner most first" or "outer most first" (or you could use left to right/right to left, but drop middle out).

I also still don't much care for the wording of #5 or #7. For #5 perhaps use 'lists' or 'collections' instead of arrays. For #7 either remove option B or specify in the question PHP v5.4 (or drop the 'and lower' part from the beginning of your quiz).

The Little Guy · September 17, 2012

I like the new ones you added.

Thank you!

New #17:

17. In what order are nested function calls evaluated?
- Outer most function first
* Inner most function first

I dropped the "and lower" its php 5.4.x now

How about this (I don't quite like "lists" or "collections"?

5. Which loop type is best used for arrays?
- do ... while
* foreach
- while
- for

Jessica · September 17, 2012

Call it a control structure, not a "loop type" and maybe say "used for iterating through an array".

The Little Guy · September 17, 2012

I like that one.

I moved it to an online text file.

http://ryannaddy.com/PHP%20Beginner.txt

scootstah · September 18, 2012

23. What is missing?
<?php

$_SESSION["name"] = "Billy Joe";

echo $_SESSION["name"];

?>

- $_SESSION = new Session();

* session_start();

- header("Content-Type: text/html");

- define("$_SESSION", array());

I don't really like that. The code will run and work fine as it stands, except it won't be a real session. Plus, it's not immediately obvious that this snippet of code is actually the start of an application.

Maybe I'm just nitpicking now.

KevinM1 · September 18, 2012

23. What is missing?
<?php

$_SESSION["name"] = "Billy Joe";

echo $_SESSION["name"];

?>

- $_SESSION = new Session();

* session_start();

- header("Content-Type: text/html");

- define("$_SESSION", array());

I don't really like that. The code will run and work fine as it stands, except it won't be a real session. Plus, it's not immediately obvious that this snippet of code is actually the start of an application.

Maybe I'm just nitpicking now.

I think it's a fair crit. Given how easy (and ubiquitous) it is to enter/exit PHP, it's hard to tell if that snippet is an entire script or if we're seeing code that's in medias res within a larger script.

Mahngiel · September 18, 2012

Q: What is the visibility of this class function: function set_name(){}

* public

Q: Who / What can access private properties or methods?

* only the class itself

Q: Who / What can access protected properties or methods?

* Class itself, parents, children

Q: Who / What can access public properties or methods?

* Everybody :yay:

KevinM1 · September 18, 2012

Q: Who / What can access protected properties or methods?

* Class itself, parents, children

This should just be "Class itself and its children."

Mahngiel · September 18, 2012

Q: Who / What can access protected properties or methods?

* Class itself, parents, children

This should just be "Class itself and its children."

http://php.net/manual/en/language.oop5.visibility.php

Members declared protected can be accessed only within the class itself and by inherited and parent classes

The Little Guy · September 18, 2012

I have testing up for the "Beginner" test, so if you wanna give it a try, here is the link:

http://phpsnips.com/test.php

Eventually it will require a login, so scores can be saved to a profile, but none of that is in place atm, just the test and the percent correct at the end.

@Mahngiel, Thanks for the questions, I will probably use those in the "Advanced" Test.

scootstah · September 18, 2012

I think "Comparisons can be passed as parameters to a function" should say "Expressions can be . . ."

Jessica · September 18, 2012

On # 11 I would add parens on the answer.

Jessica · September 18, 2012

88%?? wtf.

I want to see what I got wrong. :-P

The Little Guy · September 18, 2012

On # 11 I would add parens on the answer.

I don't know what #11 is, the questions are displayed in a random order

Jessica · September 18, 2012

The one about ternary operator

Philip · September 18, 2012

$color = $i == 2 ? "red" : "blue";

should read:

$color = ($i == 2) ? "red" : "blue";

Philip · September 18, 2012

And I agree. You already know what the answers are / weren't, so why not show us what we missed to learn?

The Little Guy · September 18, 2012

And I agree. You already know what the answers are / weren't, so why not show us what we missed to learn?

I was working on that.

KevinM1 · September 18, 2012

Q: Who / What can access protected properties or methods?

* Class itself, parents, children

This should just be "Class itself and its children."

http://php.net/manual/en/language.oop5.visibility.php

Members declared protected can be accessed only within the class itself and by inherited and parent classes

Huh. That's odd, as generally one wouldn't ever need to have a parent access a child's protected member (okay, that sounds dirty). The whole point of protected is to say "From this point on in the class hierarchy, only me and my children can see this."

scootstah · September 18, 2012

Q: Who / What can access protected properties or methods?

* Class itself, parents, children

This should just be "Class itself and its children."

http://php.net/manual/en/language.oop5.visibility.php

Members declared protected can be accessed only within the class itself and by inherited and parent classes

Huh. That's odd, as generally one wouldn't ever need to have a parent access a child's protected member (okay, that sounds dirty). The whole point of protected is to say "From this point on in the class hierarchy, only me and my children can see this."

Yeah, that sounds literally ass-backwards.

Hall of Famer · September 19, 2012

Which of the following OOP feature is not yet supported as of PHP 5.4?

A. Abstract Class

B. Inner/Nested Class

C. Interface

D. Namespace

E. Trait

And the answer is... Well we all know what it is. XD

xylex · September 19, 2012

wrong topic

Barand · September 24, 2012

BTW this code is valid (note no semicolon)

<?php
   echo 'Hello world'
?>

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