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
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
What is the purpose of the PHP include statement?
A). To include and evaluate an external PHP file
B). To create a loop in PHP
C). To define a function in PHP
D). To execute a SQL query
What is the purpose of the PHP interpreter?
A). To parse and execute PHP code
B). To generate HTML markup
C). To validate user input
D). To store data in databases
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';
Which of the following is a correct way to start a PHP script?
A). <?php
B). <script>
C). <?php?>
D). <?>
What file extension is commonly used for PHP scripts?
A). .php
B). .html
C). .js
D). .css
Which of the following is used to comment out a single line of PHP code?
A). //
B). /* */
C). <!-- -->
D). <?php ?>
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