Which of the following is used to concatenate strings in PHP?

What is the output of the following PHP code? <?php $x = 5; $y = 10; echo $x + $y; ?>

A). 15

B). 5 + 10

C). $x + $y

D). 510

Which of the following is NOT a valid PHP variable name?

A). $my_var

B). $myVar

C). $my-var

D). $myVar123

Which PHP directive is used to set the maximum execution time of a script?

A). max_execution_time

B). memory_limit

C). error_reporting

D). display_errors

Which of the following is a correct way to define a constant in PHP?

A). define('MY_CONST', 'value');

B). $MY_CONST = 'value';

C). const MY_CONST = 'value';

D). MY_CONST = 'value';

What is the purpose of the PHP echo statement?

A). To output data to the browser

B). To define a function

C). To include an external file

D). To declare a variable

Which of the following is used to comment out a single line of PHP code?

A). //

B). /* */

C). <!-- -->

D). <?php ?>

Which of the following is a correct way to start a PHP script?

A). <?php

B). <script>

C). <?php?>

D). <?>

What is the purpose of the PHP exit() function?

A). To terminate script execution

B). To display a message and exit

C). To redirect to another URL

D). To close a database connection

What does PHP stand for?

A). Personal Home Page

B). Preprocessed Hypertext Processor

C). Public Hyperlink Protocol

D). Programming Hypertext Processor

What is the output of the following PHP code? <?php echo 'Hello, World!'; ?>

A). Hello, World!

B). <?php echo 'Hello, World!'; ?>

C). <?php echo 'Hello, World!'; ?>;

D). <?php echo 'Hello, World!'; ?>;