First PHP program (Hello World) - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this PHP code?

Look at this PHP code. What will it print when run?

PHP

<?php
 echo "Hello World!";
?>

A hello world!

B Hello World!

C HelloWorld!

D Syntax Error

💡 Hint

Remember PHP is case sensitive in strings and echo prints exactly what is inside quotes.

The echo statement prints the exact string inside the quotes. So it prints Hello World! with capital H and W and a space.

❓ Predict Output

intermediate

What error does this PHP code produce?

This PHP code is missing something. What error will it cause?

PHP

<?php
 echo "Hello World!"
?>

A Parse error: syntax error, unexpected end of file

B Hello World!

C Fatal error: Uncaught Error

D No output

💡 Hint

Check if all statements end properly in PHP.

PHP requires a semicolon at the end of statements. Missing it causes a parse error.

🧠 Conceptual

advanced

Which PHP tag is correct to start PHP code?

You want to write PHP code inside an HTML file. Which tag correctly starts PHP code?

A <?php

B <php>

C <?phpcode>

D <script php>

💡 Hint

PHP code always starts with a special opening tag.

The correct opening tag for PHP code is

❓ Predict Output

advanced

What is the output of this PHP code?

What will this PHP code print?

PHP

<?php
 echo "Hello" . " " . "World!";
?>

A Hello . World!

B HelloWorld!

C Hello World!

D Hello . World!

💡 Hint

The dot (.) operator joins strings in PHP.

The dot operator concatenates strings. So it prints Hello, a space, then World! together.

❓ Predict Output

expert

What is the output of this PHP code with variables?

Look at this PHP code. What will it print?

PHP

<?php
 $greeting = "Hello";
 $target = "World!";
 echo "$greeting $target";
?>

A Hello $target

B $greeting $target

C Hello$target

D Hello World!

💡 Hint

Variables inside double quotes are replaced by their values in PHP.

PHP replaces variables inside double quotes with their values, so it prints Hello World! with a space.