Arrays MCQ question and answer with solution

11

What will be the output of the following PHP code?

<?php
$cars = array("Volvo", "BMW", "Toyota");
echo "I like " . $cars[2] . ", " . $cars[1] . " and " . $cars[0] . ".";
?>

A) I like Volvo, Toyota and BMW B) I like Volvo, BMW and Toyota C) I like BMW, Volvo and Toyota D) I like Toyota, BMW and Volvo

Discuss

Answer & Solution

Answer: Option D

Solution:

The order of elements defined.

12

What will be the output of the following PHP code?

<?php
$fname = array("Peter", "Ben", "Joe");
$age = array("35", "37", "43");
$c = array_combine($age, $fname);
print_r($c);
?>

A) Array ( Peter Ben Joe ) B) Array ( [Peter] => 35 [Ben] => 37 [Joe] => 43 ) C) Array ( 35 37 43 ) D) Array ( [35] => Peter [37] => Ben [43] => Joe )

Discuss

Answer & Solution

Answer: Option D

Solution:

Here “keys” array is $age and “values” array is $fname.

13

What will be the output of the following PHP code?

<?php
$a=array("A","Cat","Dog","A","Dog");
$b=array("A","A","Cat","A","Tiger");
$c=array_combine($a,$b);
print_r(array_count_values($c));
?>

A) Array ( [A] => 5 [Cat] => 2 [Dog] => 2 [Tiger] => 1 ) B) Array ( [A] => 2 [Cat] => 2 [Dog] => 1 [Tiger] => 1 ) C) Array ( [A] => 6 [Cat] => 1 [Dog] => 2 [Tiger] => 1 ) D) Array ( [A] => 2 [Cat] => 1 [Dog] => 4 [Tiger] => 1 )

Discuss

Answer & Solution

Answer: Option A

Solution:

The array_count_values() function counts all the values of an array and array_combine() combines arrays.

14

What will be the output of the following PHP code?

<?php
$a1 = array("a" => "red", "b" => "green", "c" => "blue", "d" => "yellow");
$a2 = array("e" => "red", "f" => "green", "g" => "blue", "h" => "orange");
$a3 = array("i" => "orange");
$a4 = array_combine($a2, $a3);
$result = array_diff($a4, $a2);
print_r($result);
?>

A) Array ( [d] => yellow ) B) Array ( [i] => orange ) C) Array ( [h] => orange ) D) Array ( [d] => yellow [h] => orange )

Discuss

Answer & Solution

Answer: Option A

Solution:

The array_diff() function compares the values of two (or more) arrays, and returns the differences.

15

What will be the output of the following PHP code?

<?php
$a1 = array("red", "green");
$a2 = array("blue", "yellow");
$a3 = array_merge($a1, $a2);
$a4 = array("a", "b", "c", "d");
$a = array_combine($a4, $a3);
print_r($a);
?>

A) Array ( [a] => blue [b] => yellow [c] => red [d] => green ) B) Array ( [0] => blue [1] => yellow [2] => red [3] => green ) C) Array ( [0] => red [1] => green [2] => blue [3] => yellow ) D) Array ( [a] => red [b] => green [c] => blue [d] => yellow )

Discuss

Answer & Solution

Answer: Option D

Solution:

Basic combined application of array_combine() and array_merge().

16

What will be the output of the following PHP code?

<?php
$names = array("Sam", "Bob", "Jack");
echo $names[0] . "is the brother of " . $names[1] . " and " . $names[1] . ".";
?>

A) Sam is the brother of Bob and Jack B) Sam is the brother of Bob and Bob) C) Sam is the brother of Jack and Bob) D) Error

Discuss

Answer & Solution

Answer: Option B

Solution:

Simple definition of array and using it in a string. We have used $names[1] twice and hence Bob appears twice.

17

What will be the output of the following PHP code?

<?php
$names = array("Sam", "Bob", "Jack");
echo $names[0] . "is the brother of " . $names[1] . " and " . $names[1] . ".".$brother;
?>

A) Sam is the brother of Bob and Bob) $brother B) Sam is the brother of Bob and Bob) C) $brother D) Error

Discuss

Answer & Solution

Answer: Option D

Solution:

$brother undeclared.

18

What will be the output of the following PHP code?

<?php
$place = array("NYC", "LA", "Paris");
array_pop($place);
$place1 = array("Paris");
$place = array_merge($place, $place1);
print_r($place);
?>

A) Array ( [0] => LA [1] => Paris [2] => Paris ) B) Array ( [0] => NYC [1] => LA [2] => Paris) C) Array ( [0] => NYC [1] => LA [2] => Paris [3] => Paris ) D) None of the mentioned

Discuss

Answer & Solution

Answer: Option A

Solution:

array_merge() and array_pop() yields that result.

19

What will be the output of the following PHP code ?

<?php
$age = array("Harry" => "21", "Ron" => "23","Malfoy" => "21");
array_change_key_case($age, CASE_UPPER);
array_pop($age);
print_r($age);
?>

A) Array ( [Harry] => 21 [Ron] => 23 [Malfoy] => 21 ) B) Array ( [HARRY] => 21 [RON] => 23 [MALFOY] => 21 ) C) Array ( [HARRY] => 21 [RON] => 23 ) D) Array ( [Harry] => 21 [Ron] => 23 )

Discuss

Answer & Solution

Answer: Option C

Solution:

The array_change_key_case() function changes all keys in an array to lowercase or uppercase and arry_pop() removes last element

20

What will be the output of the following PHP code ?

<?php
$a1 = array("a" => "red", "b" => "green", "c" => "blue", "d" => "yellow");
$result = array_flip($a1);
print_r($result);
?>

A) Array ( [red] => red [green] => green [blue] => blue [yellow] => yellow ) B) Array ( [a] => a [b] => b [c] => c [d] => d ) C) Array ( [red] => a [green] => b [blue] => c [yellow] => d ) D) Array ( [a] => red [b] => green [c] => blue [d] => yellow )

Discuss

Answer & Solution

Answer: Option C

Solution:

The array_flip() function flips/exchanges all keys with their associated values in an array.

Arrays MCQ question and answer with solution | PHP Programming