What is PHP - Practice Questions & Exercises

Challenge - 5 Problems

🧠 Conceptual

intermediate

What is PHP primarily used for?

PHP is a popular language. What is its main use?

A Managing databases directly without a server

B Designing the layout of web pages with styles

C Writing scripts that run only in the browser

D Creating dynamic web pages on the server side

💡 Hint

Think about where PHP code runs: on the server or the browser?

PHP runs on the server to create web pages that can change based on user input or data.

❓ Predict Output

intermediate

What is the output of this PHP code?

Look at this PHP code and choose the output it produces.

PHP

<?php
$number = 5;
echo $number * 2;
?>

A 5

B 10

C Error: undefined variable

D 52

💡 Hint

Multiplying 5 by 2 gives what number?

The variable $number holds 5, multiplying by 2 results in 10.

🔧 Debug

advanced

What error does this PHP code produce?

Find the error in this PHP snippet and identify the error message.

PHP

<?php
echo 'Hello World\n';
?>

A No error, outputs Hello World

B Notice: Undefined variable 'Hello World'

C Fatal error: Call to undefined function echo()

D Parse error: syntax error, unexpected end of file

💡 Hint

Check if all quotes and tags are properly closed.

The string is missing a closing quote, causing a syntax error.

📝 Syntax

advanced

Which option correctly declares a PHP variable?

Choose the correct way to declare a variable holding the number 10 in PHP.

A $num = 10;

B var num = 10;

C num = 10;

D let $num = 10;

💡 Hint

Remember PHP variables start with a special symbol.

PHP variables always start with a dollar sign ($).

🚀 Application

expert

What is the value of $result after running this PHP code?

Analyze the code and find the value stored in $result.

PHP

<?php
function add($a, $b = 3) {
  return $a + $b;
}
$result = add(4);
?>

A Error: Missing argument for function

B 4

C 7

D 3

💡 Hint

Check the default value of the second parameter.

The function adds $a and $b. $b defaults to 3 if not given, so 4 + 3 = 7.