PHP Technical Questions

1. What does the following code return?
$arr = array(1,3,5);
$count = count($arr);
if ($count = 0) {
echo "An array is empty.";
} else {
echo "An array has $count elements.";
}
1. An array has 3 elements.
2. An array consists of 0 elements.
3. An array is empty.
Answer: 2

2.What is the result of the following code?
$a = 10;
if($a > 5 OR < 15)
echo "true";
else
echo "false";
1. true
2. false
3. There is a syntax error will display.
4. Nothing will be displayed.
Answer: 3

3. Which of the statements is not true of the interfaces?
1. A class can implement multiple interfaces.
2. Methods with the same names and arguments can exist in multiple interfaces, this class
implements.
3. An abstract class can implement multiple interfaces.
4. The interface itself can extend multiple interfaces.
Answer: 2

4. If you want to pass the argument of the function by reference, the correct path would be:
1. function ModifyReport(&$Rptfile){}
2. function ModifyReport($Rptfile){}
3. function ModifyReport(ByRef $Rptfile){}
4. function ModifyReport(&Rptfile){}
Answer: 1

5.Which of the following pairs of operators are not opposite?
1. +, -
2. &=, |=
3. ==, !=
4. <<, >>
Answer: 2

1|Page Pankaj Kumar Jha (www.globaljournals.org)

6. Which of the following casts are not true?
<?php
$fig = 23;
$varbl = (real) $fig;
$varb2 = (double) $fig;
$varb3 = (decimal) $fig;
$varb4 = (bool) $fig;
?>
1. real
2. double
3. decimal
4. boolean
Answer: 3

7. Choose false statement about abstract classes in PHP5.
1. Abstract classes are introduced in PHP5.
2. An abstract method's definition may contain method body.
3. Class with at least one abstract method must be declared as abstract.
4. An abstract class may contain non-abstract methods.
Answer: 2

8. Which of the following functions returns the longest hash value?
1. sha1()
2. md5()
3. crc32()
4. All these functions return the same hash value.
Answer: 1

9. Which of these characters can be processed by the htmlspecialchars() function?
1. ' - single quote
2. '' - double quote
3. < - less than
4. > - greater than
5. & - an ampersand
6. All
Answer: 6

10. Choose all valid PHP5 data types.
1. money
2. varchar
3. float
4. char
5. complex
Answer: 3


11. How many parameters can be passed to this function?
<?
function f() {
...
}
?>
1. 0 (zero)
2. 1 (one)
3. that amount determined by the php configuration.
4. any number of params.
Answer: 4

12. What gets printed?
<?php
$var = 'false';

if ($var) {
echo 'true';
} else {
echo 'false';
}
?>
Answer: true [This is a string literal, which converts to Boolean true ]

13. Which of the following is used to declare a constant
1. const
2. constant
3. define
4. #pragma
5. Def

Answer: 3
Here is an example of declaring and using a constant:
define(PI, 3.14);
printf("PI = %.2fn", PI);

14. What will be printed?
<?php
$var = '0';
if ($var) {
echo 'true';
} else {
echo 'false';
}
?>
Answer: false


15. What will be the value of $var?

<?php $var = 1 / 2; ?>
1. 0
2. 0.5
3. 1

Answer:2

16. How do we access the value of 'd' later?
$a = array( 'a', 3 => 'b', 1 => 'c', 'd' );
1. $a[0]
2. $a[1]
3. $a[2]
4. $a[3]
5. $a[4]

Answer: 5

17. Which of the following is NOT a magic predefined constant?
1. __LINE__
2. __FILE__
3. __DATE__
4. __CLASS__
5. __METHOD__

Answer: 3

$a = array();
if ($a == null) {
echo 'true';
} else {
echo 'false';
}

Answer: true[empty array converts to null ]

if (null === false) {
echo 'true';
} else {
echo 'false';
}
Answer: false
=== is true if values are equal and of the same type, false is of the boolean type, but null is of the special null type


<?php
$RESULT = 11 + 011 + 0x11;
echo "$RESULT";
?>
1. 11
2. 22
3. 33
4. 37
5. 39
Answer: 4 [A decimal plus an octal plus a hex number. 11 + 9 + 17 = 37 ]

21. What will be the value of $var below?
$var = true ? '1' : false ? '2' : '3';
1. 1
2. 2
3. 3

Answer: 2[ternary expressions are evaluated from left to right]

if ('2' == '02') {
echo 'true';
} else {
echo 'false';
}

Answer: true [Numerical strings are compared as integers]

23. Which of the following is NOT a valid PHP comparison operator?
1. !=
2. >=
3. <=>
4. <>
5. ===
6.
Answer:3

$var = 'a';
$VAR = 'b';
echo "$var$VAR";
1. aa
2. bb
3. ab

Answer: 3[Variable names are case-sensitive]



$a = array( null => 'a', true => 'b', false => 'c', 0 => 'd', 1 => 'e', '' => 'f');
echo count($a), "n";
1. 2
2. 3
3. 4
4. 5
5. 6

Answer: 2[Keys will be converted like this: null to '' (empty string), true to 1, false to 0 ]


class MyException extends Exception {}
try {
throw new MyException('Oops!');
} catch (Exception $e) {
echo "Caught Exceptionn";
} catch (MyException $e) {
echo "Caught MyExceptionn";
}

Answer: Caught Exception [The first catch will match because MyException is a subclass of Exception, so the
second catch is unreachable ]


$a = array();
if ($a[1]) null;
echo count($a), "n";
1. 0
2. 1
3. 2
4. this code won't work

Answer: 1[checking value in if() does not create an array element ]

28. What will be printed by the below code?

$a = 1;
{
$a = 2;
}
echo $a, "n";

Answer: 2 [PHP variables only have a single scope (except in functions) ]


<?php
$str = 'abn';
echo $str;
?>
1. ab(newline)
2. ab(newline)
3. abn
4. ab(newline)
5. abn
Answer: 3 [ is a special case in single-quoted string literals, which gives a single , n is not interpolated in single-
quoted string literals ]

30. Which statement about the code below is correct?

class A {}
class B {}
class C extends A, B {}

1. the code is perfectly fine
2. classes can not be empty
3. class C can not extend both A and B
4. qualifiers 'public' or 'private' are missing in class definitions

Answer: 3 [A class can only inherit one base class ]


<?php
$x=array("aaa","ttt","www","ttt","yyy","tttt");
$y=array_count_values($x);
echo $y[ttt];
?>
a)2
b)3
c)1
d)4

Answer: a
eg:
<?php
$array = array(1, "hello", 1, "world", "hello");
print_r(array_count_values($array));
?>

After execution of above script we will get output:
Array


(
[1] => 2 //1 came two times in array
[hello] => 2 //Hello came two times in array
[world] => 1
)

32. What's the best way to copy a file from within a piece of PHP?
1. Print out a message asking your user to "telnet" in to the server and copy the file for you
2. Open the input and output files, and use read() and write() to copy the data block by
block until read() returns a zero
3. Use the built in copy() function
4. Use "exec" to run an operating system command such as cp (Unix, Linux) or copy
(Windows)

Answer: 3

33. In php Which method is used to getting browser properties?
1. $_SERVER['HTTP_USER_AGENT'];
2. $_SERVER['PHP_SELF']
3. $_SERVER['SERVER_NAME']
4. $_SERVER['HTTP_VARIENT']

Answer: 1

34. Assume that your php file 'index.php' in location c:/apache/htdocs/phptutor/index.php. If you
used $_SERVER['PHP_SELF'] function in your page, then what is the return value of this
function ?
1. phptutor/index.php
2. /phptutor/index.php
3. c:/apache/htdocs/phptutor/index.php
4. index.php

Answer: 2

35. What will be the ouput of below code ?
Assume that today is 2009-5-19:2:45:32 pm
<?php

$today = date("F j, Y, g:i a");

?>

1. May 19,09,2:45:32 PM
2. May 19, 2009, 2:45 pm
3. May 19,2009,14:45:32 pm
4. May 19,2009,14:45:32 PM


Answer: 2

36. What function used to print statement in PHP?
1. echo();
2. printf
3. "
Answer: 1

37. <?php
define("x","5");
$x=x+10;
echo x;
?>
1. Error
2. 15
3. 10
4. 5

Answer: 4

38. PHP variables are
1. Multitype variables
2. Double type variables
3. Single type variable
4. Trible type variables

Answer: 1

39. Which of these statements is true?
1. PHP interfaces to the MySQL database,and you should transfer any data in Oracle or
Sybase to MySQL if you want to use PHP on the data.
2. PHP interfaces to a number of relational databases such as MySQL, Oracle and
Sybase. A wrapper layer is provided so that code written for one database can easily be
transferred to another if you later switch your database engine.
3. PHP interfaces to a number of relational databases such as MySQL, Oracle and Sybase
but the interface differs in each case.
4. There's little code in PHP to help you interface to databases, but there's no reason why
you can't write such code if you want to.

Answer: 3

40. Which of the following is used to check if a function has already been defined?
1. bool function_exists(functionname)
2. bool f_exists(functionname)
3. bool func_exist(functioname)

Answer: 1


41. Assume that your php file 'index.php' in location c:/apache/htdocs/phptutor/index.php. If you
used basename($_SERVER['PHP_SELF']) function in your page, then what is the return value
of this function ?
1. phptutor
2. phptutor/index.php
3. index.php
4. /index.php

Answer: 3

42. Below program will call the function display_result() ?
<?php
$x="display";
${$x.'_result'} ();
?>
1. False
2. True
3. Parser Error
4. None of the above

Answer: 2


<?php
$str="3dollars";
$a=20;
$a+=$str;
print($a);
?>
1. 23dollars
2. 203dollars
3. 320dollars
4. 23

Answer: 4


<?php
function zz(& $x)
{
$x=$x+5;
}
?>
$x=10;

10 | P a g e Pankaj Kumar Jha (www.globaljournals.org)

zz($x);
echo $x;

1. 5
2. 0
3. 15
4. 10

Answer: 3

45. What is the following output?

<?php
$x=dir(".");
while($y=$x->read())
{
echo $y."
"
}
$y->close();
?>

1. display all folder names
2. display a folder content
3. display content of the all drives
4. Parse error

Answer: 2

46. <?php
$test="3.5seconds";
settype($test,"double");
settype($test,"integer");
settype($test,"string");
print($test);
?>

What is the following output?
1. 3.5
2. 3.5seconds
3. 3
4. 3second

Answer: 3

47. PHP is
1. Partially cross-platform


2. Truly cross-platform
3. None of above

Answer: 2

48. PHP is a _____ . It means you do not have to tell PHP which data type the variable is.PHP
automatically converts the variable to the correct data type, depending on its value.
1. client side language
2. local language
3. global language
4. loosely typed language

Answer: 4

49. Which of the following function is used to change the root directory in PHP?
1. choot()
2. change_root()
3. cd_root()
4. cd_r()
Answer: 1

50. The PHP syntax is most similar to:
1. PERL and C
2. Java script
3. VB Script
4. Visual Basic

Answer: 1

51. What will be the output of below code ?
<?php

$arr = array(5 => 1, 12 => 2);
$arr[] = 56;
$arr["x"] = 42;
echo var_dump($arr);

?>

1. 42
2. array(3) { [12]=> int(2) [13]=> int(56) ["x"]=> int(42) }
3. array(4) { [5]=>int(1) [12]=> int(2) [13]=> int(56) ["x"]=> int(42) }
4. 1,2,56,42

Answer: 3

52. What is the output of the following PHP script?


<?php
define('SOMEVAL', 0);

if (strlen(SOMEVAL) > 0) {
echo "Hello";
}
else {
echo "Goodbye";
}
?>
1. Goodbye
2. Hello
3. Syntax Error

Answer:

53. Consider the following PHP code:
<?php
$myArray = array(
10, 20, 30, 40
);
?>

What is the simplest way to return the values 20 and 30 in a new array without
modifying $myArray?

1. array_slice($myArray, 1, 2);
2. array_splice($myArray, 2, 1);

Answer:

54. What will this output

<?php
$a = false;
$b = true;
$c = false;

if ($a ? $b : $c) {
echo "false";
} else {
echo "true";
}
?>


Answer: true

Explanation: If $a is true, then $b will be evaluated; otherwise (as is the case here) $c will be
evaluated. As $c is false, the conditional evaluates as false, and the script (confusingly) prints
true.

55: What can you use to replace like with hate in I like Regular Expressions?

Answer: preg_replace("/like/", "hate", "I like Regular Expressions")

Explanation: The search is a regular expression and it has slashes around it, the replace isn't,
so it doesn't have any slashes.

56. What library do you need in order to process images?

Answer. GD library

57. What function sends mail:

Answer: imap_mail, mail

58: What is the problem with <?=$expression ?> ?

Answer: It requires short tags and this is not compatible with XML

Explanation: If you have short_open_tag On then this XML <?xml version="1.0" encoding="utf-
8"?> (for example) will be parsed by the PHP engine, causing both a PHP and a XML parsing
error.

59: Put this line php display_errors=false in a .htaccess file when you deploy the application?
Answer: That won't hide any error 'coz it's not the correct code

Explanation: I would have said 'Good idea, increases security', but wait a minute... the correct
syntax is php_flag display_errors Off ...

60. Which of the following regular expressions will match the string go.go.go?
Answer: ........

Explanation: Any character (twice) followed by a period followed by any character (twice)
followed by ...

61: A constructor is a special kind of _______________

Answer: Method

Explanation: It is a function, but since it's in a class we call it a method.


62: What does break; do?

Answer: Ends execution of the current for, foreach, while, do-while or switch structure

Explanation: Yup. If you were tempted to say 'moves on to the next iteration', that's the continue
statement.

63: Can this PHP code be valid:

$4bears = $bears->getFirst4();

Answer: No

Explanation: A variable name can't start with a number. Don't ask me why not, I don't see any
reason why it shouldn't; it's probably some carry over from C.

64. What will this output:
<?php
$dog = "Dogzilla";
$dragon = &$dog;
$dragon = "Dragonzilla";

echo $dog." ";
echo $dragon;
?>

Answer: Dragonzilla Dragonzilla

Explanation: $dragon is really $dog, it just has a different name.

65: Assuming all the variables a, b, c have already been defined, could this be a variable name:
${$a}[$b][$c] ?

Answer: Yes

Explanation: Yup, it's a multidimensional array.

66: In MySQL, if you want to find out about the structure of a table tblQuiz, what will you use?

Answer: DESCRIBE tblQuiz

67: In which of the following scenarios might you use the function md5?
1. perform large number multiplication
2. perform authentication without unnecessarily exposing the access credentials

Answer: 2


Explanation: md5 returns an unique hash string for the string you pass it; if you have only the
hash it's practically impossible to find the string that produces it.

68: What does this function do:

<?php
function my_func($variable)
{
return (is_numeric($variable) && $variable % 2 == 0);
}
?>

Answer: tests whether $variable is an even number

Explanation: It returns true if $variable is divisible by 2.

69: How do you find the square root of a number?

Answer: In both PHP and MySQL you have a function called sqrt

70: Assuming results of a bunch of quizzes are kept in the following table, how do you print all
the quizzes' names and their average score (quizName is 'Php Mysql', 'Css Html', 'Web Design'
and so on for other quizzes)?

+--------------+--------------+
| Field | Type |
+--------------+--------------+
| userName | varchar(20) |
| userScore | tinyint(3) |
| userComments | varchar(255) |
| quizName | varchar(20) |
+--------------+--------------+
Answer: select quizName, avg(userScore) from tblQuiz group by quizName;

71: Is this quiz table normalized and is that OK?

+--------------+--------------+
| Field | Type |
+--------------+--------------+
| userName | varchar(20) |
| userEmail | varchar(20) |
| userScore | tinyint(3) |
| userComments | varchar(255) |
| quizName | varchar(20) |
| quizType | varchar(20) |
| quizUrl | varchar(20) |


+--------------+--------------+

Answer: it's not normalized, and that's NOT OK

Explanation: The quiz data (name, type, url) should be moved in a new table because it repeats
itself on many rows. The table that stores results should be linked to this new table by a foreign
key.

72: Which is the correct timeline (OO stands for object oriented)?

1. OO Programming, OO Analysis, OO Design
2. OO Analysis, OO Design, OO Programming
Answer: 2

Explanation: First Analysis, then Design, then Programming.

73: What does this output:
class T
{
public $m = "a";

function T()
{
$this->m = "b";
}
}

$t = new T();
$p = $t->m;
$p = "c";

echo $t->m;

Answer: b

Explanation: $p = "c"; does not modify the object member.


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