Arrays MCQ question and answer with solution

41

What will be the output of the following PHP code?

<?php
$fruits = array ("apple", "mango", "peach", "pear", "orange");
$subset = array_splice ($fruits, 2);
print_r ($fruits);
?>

A) Error B) Array ( [0] => apple [1] => mango [2] => peach ) C) Array ( [0] => apple [1] => mango ) D) Array ( [0] => pear [1] => orange )

Discuss

Answer & Solution

Answer: Option C

Solution:

The array_splice() function removes all elements of an array found within a specified range.

42

What will be the output of the following PHP code?

<?php
$number = array ("4", "hello", 2);
echo (array_sum ($number));
?>

A) 4hello2 B) 4 C) 2 D) 6

Discuss

Answer & Solution

Answer: Option D

Solution:

The array_sum() function add all the values of the input array together, returning the final sum. If a string datatype is found, it’ll be ignored.

43

What will be the output of the following PHP code?

<?php
$array1 = array ("KA", "LA", "CA", "MA", "TA");
$array2 = array ("KA", "IA", "CA", "GA", "TA");
$inter = array_intersect ($array1, $array2);
print_r ($inter);
?>

A) Array ( [0] => KA [1] => LA [2] => CA [3] => MA [4] => TA [5] => IA [6] => GA ) B) Array ( [0] => KA [2] => CA [4] => TA ) C) Array ( [1] => IA [3] => GA ) D) Array ( [1] => LA [3] => MA )

Discuss

Answer & Solution

Answer: Option B

Solution:

The array_intersect() function returns a key preserved array consisting only of those values present in the first array that are also present in each of the other input arrays.

44

Array values are keyed by ______ values (called indexed arrays) or using ______ values (called associative arrays). Of course, these key methods can be combined as well.

A) Float, string B) Positive number, negative number C) Even number, string D) String, Boolean E) Integer, string

Discuss

Answer & Solution

Answer: Option E

No explanation is given for this question. Let's Discuss on Board

45

What will the following script output?
<?php
$array = array (1, 2, 3, 5, 8, 13, 21, 34, 55);
$sum = 0;
for ($i = 0; $i < 5; $i++) {
$sum += $array[$array[$i]];
}
echo $sum;
?>

A) 78 B) 19 C) NULL D) 5

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

46

What elements will the following script output?

<?php
$array = array (true => 'a', 1 => 'b');
var_dump ($array);
?>

A) 1 => 'b' B) True => 'a', 1 => 'b' C) 0 => 'a', 1 => 'b' D) None E) It will output NULL

Discuss

Answer & Solution

Answer: Option E

No explanation is given for this question. Let's Discuss on Board

47

Which array function checks if the specified key exists in the array?

A) array_key_exist() B) array_key_exists() C) array_keys_exists() D) arrays_key_exists()

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

48

There are three different kind of arrays:

A) Numeric array, String array, Multidimensional array B) Numeric array, Associative array, Dimensional array C) Numeric array, Associative array, Multidimensional array D) Const array, Associative array, Multidimensional array

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

49

Absent any actual need for choosing one method over the other, does passing arrays by value to a read-only function reduce performance compared to passing them by reference?

A) Yes, because the interpreter must always create a copy of the array before passing it to the function. B) Yes, but only if the function modifies the contents of the array. C) Yes, but only if the array is large. D) Yes, because PHP must monitor the execution of the function to determine if changes are made to the array. E) No

Discuss

Answer & Solution

Answer: Option E

No explanation is given for this question. Let's Discuss on Board

50

Assume you would like to sort an array in ascending order by value while preserving key associations. Which of the following PHP sorting functions would you use?

A) ksort() B) asort() C) krsort() D) sort() E) usort()

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

Arrays MCQ question and answer with solution | PHP Programming