Questions and answers for exam Preparation

MCQs

Total Questions : 53 | Page 5 of 6 pages

Question 41. 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.

Float, string
Positive number, negative number
Integer, string
Even number, string
String, Boolean

Discuss Question

Answer: Option C. -> Integer, string

Question 42. What will the following script output?$array = array (1, 2, 3, 5, 8, 13, 21, 34, 55);$sum = 0;for ($i = 0; $i < 5; $i++) {$sum += $array[$array[$i]];}echo $sum;

78
5
NULL
19

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Answer: Option A. -> 78

Question 43. What will be the output of the following PHP code?$number = array ("4", "hello", 2);echo (array_sum ($number));

6
4
2
4hello2

Discuss Question

Answer: Option A. -> 6

Question 44. What will be the output of the following PHP code?$fruits = array ("apple", "mango", "peach", "pear", "orange");$subset = array_splice ($fruits, 2);print_r ($fruits);

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

Discuss Question

Answer: Option D. -> Array ( [0] => apple [1] => mango )

Question 45. What will be the output of the following PHP code?$array1 = array ("KA", "LA", "CA", "MA", "TA");$array2 = array ("KA", "IA", "CA", "GA", "TA");$inter = array_intersect ($array1, $array2);print_r ($inter);

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

Discuss Question

Answer: Option A. -> Array ( [0] => KA [2] => CA [4] => TA )

Question 46. 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?

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

Discuss Question

Answer: Option C. -> No

Question 47. 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?