What is the purpose of the PHP require_once statement?

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

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

Which of the following is true about PHP variables?

A). Variables must be declared before use

B). Variable names are case-insensitive

C). Variables cannot be reassigned

D). Variables can only store integers

Which of the following is a valid PHP constant?

A). MY_CONST

B). $myConst

C). MY_CONST

D). myConst

What does the phpinfo() function do in PHP?

A). Displays information about the PHP environment

B). Executes SQL queries

C). Validates user input

D). Encrypts data transmission

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

A). To destroy a specified variable

B). To create an array in PHP

C). To execute SQL queries

D). To define a function in PHP

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

A). +

B). <>

C). .

D). -