Which of the following PHP functions is used to convert a string to uppercase?

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 output of the following PHP code?

<?php
$name = 'John';
echo 'Hello, $name!';
?>

A). Hello, John!

B). Hello, $name!

C). Hello, !

D). Undefined variable: name

What will be the output of the following PHP code?

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

A). 15

B). 5

C). 10

D). Error

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

A). 0

B). 1

C). 3

D). 10

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 is a correct way to assign a floating-point number to a variable in PHP?

A). $price = 10.99;

B). $price = '10.99';

C). $price = '10.99';

D). $price = 10;

What data type is the variable $age = 25; in PHP?

A). Integer

B). String

C). Boolean

D). Float

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

What does the following PHP code output?

<?php
$x = '10';
$y = 20;
echo $x + $y;
?>

A). 30

B). 1020

C). Error

D). 102

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

A). $my_var

B). $my-var

C). $my var

D). my_var