What will be the output of the following PHP code?

$x = 10;
$y = 5;
echo $x + $y;
?>

What is the value of $x after the following PHP code is executed?

<?php
$x = 5;
$x += 3;
echo $x;
?>

A). 5

B). 8

C). 15

D). 3

What will be the output of the following PHP code?

<?php
$x = 10;
echo ++$x;
?>

A). 10

B). 11

C). 9

D). Error

What will be the result of the expression 'Hello' . ' World' in PHP?

A). 'Hello World'

B). 'Hello . World'

C). 'Hello + World'

D). 'Hello, World'

What will be the result of the expression 10 % 3 in PHP?

A). 0

B). 1

C). 3

D). 10

Which of the following statements is true about PHP comments?

A). Comments are ignored by the PHP interpreter

B). Comments can only be single-line

C). Comments must start with /* and end with */

D). Comments are displayed on the webpage

Which of the following PHP functions is used to find the length of an array?

A). count()

B). length()

C). size()

D). sizeof()

Which of the following PHP operators is used for concatenation of strings?

A). .

B). +

C). &&

D). *

Which of the following is a valid variable name in PHP?

A). $my_var

B). $my-var

C). $my var

D). my_var

What will be the output of the following PHP code?

<?php
$x = 5;
$y = 10;
echo 'The sum is: ' . ($x + $y);
?>

A). The sum is: 15

B). The sum is: 5 + 10

C). The sum is: $x + $y

D). The sum is: 510

What is the purpose of the following PHP function?

strlen('Hello')

A). Returns the length of a string

B). Converts a string to lowercase

C). Checks if a string contains a substring

D). Returns the first occurrence of a substring in a string