Which of the following is true about PHP variables?

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

A). To terminate the script execution

B). To print output to the browser

C). To create a loop in PHP

D). To define a function in PHP

What is the purpose of the PHP require statement?

A). To include and evaluate an external PHP file

B). To define a function in PHP

C). To create a loop in PHP

D). To execute a SQL query

What is the purpose of the PHP require_once statement?

A). To include and evaluate an external PHP file only once

B). To create a loop in PHP

C). To define a function in PHP

D). To execute a SQL query

Which of the following is NOT a valid PHP comparison operator?

A). <=

B). ==

C). <>

D). !

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

A). To print human-readable information about a variable

B). To redirect output to a file

C). To execute SQL queries

D). To define a function in PHP

What does the strlen() function do in PHP?

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 is the 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 valid PHP constant?

A). MY_CONST

B). $myConst

C). MY_CONST

D). myConst

What is the correct syntax to start a PHP script?

A). <?php

B). <script>

C). <?>

D). <!DOCTYPE php>

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