Practice Arrays Multiple Choice Questions with Answers Quiz-1

Q.1.

What function computes the difference of arrays?

array_diff
diff_array
arrays_diff
diff_arrays

Q.2.

What functions count elements in an array?
1. count
2. Sizeof
3. Array_Count
4. Count_array

Option 2 and 4
Option 1 and 2
Option 3 and 4
Option 1 and 4

Q.3.

What array will you get if you convert an object to an array?

An array with properties of that object as the array's elements
An array with properties of that array as the object's elements
An array with properties of that object as the Key elements
An array with keys of that object as the array's elements

Q.4.

What elements will the following script output?

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

1 => 'b'
True => 'a', 1 => 'b'
0 => 'a', 1 => 'b'
None
It will output NULL

Q.5.

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);
?>

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

Explanation

Q.6.

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

array_key_exist()
array_key_exists()
array_keys_exists()
arrays_key_exists()

Q.7.

There are three different kind of arrays:

Numeric array, String array, Multidimensional array
Numeric array, Associative array, Dimensional array
Numeric array, Associative array, Multidimensional array
Const array, Associative array, Multidimensional array

Q.8.

What will be the output of the following PHP code ?

<?php
$number = range(0, 5);
print_r ($number);
?>

Array ( [0] => 0 [1] => 1 [2] => 2 [3] => 3 [4] => 4 [5] => 5 )
Array ( [0] => 0 [1] => 0 [2] => 0 [3] => 0 [4] => 0 [5] => 0 )
Array ( [0] => 5 [1] => 5 [2] => 5 [3] => 5 [4] => 5 [5] => 5 )
Array ( [0] => 0 [5] => 5 )

Explanation

Q.9.

What will be the output of the following PHP code?

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

4hello2
4
2
6

Explanation

Q.10.

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);
?>

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

Explanation

Q.11.

What will be the output of the following PHP code?

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

Array ( [A] => 2 [Cat] => 1 [Dog] => 2 )
Array ( [A] => 2 [Cat] => 2 [Dog] => 1 )
Array ( [A] => 1 [Cat] => 1 [Dog] => 2 )
Array ( [A] => 2 [Cat] => 1 [Dog] => 1)

Explanation

Q.12.

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");
$result = array_diff($a1, $a2);
print_r($result);
?>

Array ( [d] => yellow )
Array ( [c] => blue )
Array ( [a] => red )
Array ( [e] => yellow )

Explanation

Q.13.

What will be the output of the following PHP code?

<?php
$fruits = array ("mango", "apple", "pear", "peach");
$fruits = array_flip($fruits);
echo ($fruits[0]);
?>

mango
error
peach
0

Explanation

Q.14.

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

Q.15.

What will be the output of the following PHP code ?

<?php
$array = array("red", "green");
array_push($array, "blue", "yellow");
print_r($array);
?>

Array ( [0] => red [1] => green [2] => blue [3] => yellow )
Array ( [0] => blue [1] => yellow [2] => red [3] => green )
Array ( [0] => red [1] => green )
Array ( [0] => blue [1] => yellow )

Explanation

Q.16.

What will be the output of the following PHP code?

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

Array ( [Peter] => 35 [Ben] => 37 [Joe] => 43 )
Array ( [peter] => 35 [ben] => 37 [joe] => 43 )
Array ( [PETER] => 35 [BEN] => 37 [JOE] => 43 )
Array ( [PeTeR] => 35 [BeN] => 37 [Joe] => 43 )

Explanation

Q.17.

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
Even number, string
String, Boolean
Integer, string

Q.18.

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;
?>

78
19
NULL
5

Q.19.

What will be the output of the following PHP code?

<?php
$a1 = array("red", "green");
$a2 = array("blue", "yellow");
print_r(array_merge($a1, $a2));
?>

Array ( [0] => red [1] => green)
Array ( [0] => blue [1] => yellow [2] => red [3] => green )
Array ( [0] => red [1] => green [2] => blue [3] => yellow )
Array ( [0] => blue [1] => yellow )

Explanation

Q.20.

What will be the output of the following PHP code?

<?php
$fruits = array ("mango", "apple", "peach", "pear");
$fruits = asort ($fruits);
printr ($fruits);
?>

Array ( [1] => apple [0] => mango [2] => peach [3] => pear )
Array ( [0] => apple [1] => mango [2] => peach [3] => pear )
Error
Array ( [1] => apple [0] => mango [3] => peach [2] => pear )

Explanation

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