Which of the following is true about PHP variables?

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

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

A). +

B). <>

C). .

D). -

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 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 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 statements is true about PHP arrays?

A). PHP arrays can hold values of different data types

B). PHP arrays must have continuous index values

C). PHP arrays are immutable

D). PHP arrays can only store integers

Which of the following is true about PHP data types?

A). PHP is a strongly typed language

B). Variables must be explicitly declared with data types

C). PHP supports dynamic typing

D). PHP only supports numeric data types

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 is the correct syntax to start a PHP script?

A). <?php

B). <script>

C). <?>

D). <!DOCTYPE php>