What type of index do indexed arrays in PHP use?

What will be the output of the following PHP code?
<?php
$matrix = array(
array(1, 2, 3),
array(4, 5, 6),
array(7, 8, 9)
);
echo $matrix[1][2];
?

A). 1

B). 2

C). 4

D). 6

Which PHP function is used to determine the number of elements in an array?

A). size()

B). count()

C). length()

D). elements()

What will be the output of the following PHP code?
<?php
$info = array('name' => 'Alice', 'age' => 25);
echo count($info);
?

A). 1

B). 2

C). 25

D). Alice

Which of the following statements is true about associative arrays in PHP?

A). They only allow numeric indices

B). They store elements in a sequential order

C). They use key-value pairs to access elements

D). They cannot be accessed using loop constructs

Which PHP function is used to sort an array in ascending order, maintaining the key-value pairs?

A). sort()

B). ksort()

C). asort()

D). rsort()

What will be the output of the following PHP code?
<?php
$numbers = array(10, 20, 30, 40, 50);
array_pop($numbers);
foreach ($numbers as $number) {
echo $number . ' ';
}
?

A). 20 30 40 50

B). 10 20 30 40

C). 10 20 30 40

D). 10 20 30 40 50

What will be the output of the following PHP code?
<?php
$numbers = array(10, 20, 30, 40, 50);
echo count($numbers);
?

A). 10

B). 20

C). 5

D). 50

What is the correct way to access the first element of an indexed array in PHP?

A). $array[0]

B). $array[1]

C). $array['first']

D). $array['0']

What is the purpose of the array_key_exists() function in PHP?

A). To check if a specified key exists in an array

B). To check if a specified value exists in an array

C). To retrieve all keys from an array

D). To retrieve all values from an array

What will be the output of the following PHP code?
<?php
$colors = array('Red' => 1, 'Green' => 2, 'Blue' => 3);
asort($colors);
foreach ($colors as $color => $value) {
echo '$color: $value ';
}
?

A). Red: 1 Green: 2 Blue: 3

B). 1: Red 2: Green 3: Blue

C). 1: Blue 2: Green 3: Red

D). Red: 3 Green: 2 Blue: 1