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

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 does the following PHP code output?

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

A). 30

B). 1020

C). Error

D). 102

What will be the output of the following PHP code?

<?php
$x = 5;
echo $x--;
echo $x;
?>

A). 5 4

B). 5 5

C). 4 4

D). 4 5

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

A). 'Hello World'

B). 'Hello . World'

C). 'Hello + World'

D). 'Hello, World'

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 is the correct way to declare a variable in PHP?

A). $name = 'John';

B). name = 'John';

C). var name = 'John';

D). String name = 'John';

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

A). $my_var

B). $my-var

C). $my var

D). my_var

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

A). count()

B). length()

C). size()

D). sizeof()

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

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