First PHP program (Hello World) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print 'Hello World' in PHP.

PHP

<?php
[1] "Hello World";
?>

Drag options to blanks, or click blank then click option'

Awrite

Bprint

Cshow

Decho

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'write' or 'show' which are not PHP commands.

Forgetting the semicolon at the end.

The echo statement outputs text in PHP. It is the simplest way to display 'Hello World'.

2fill in blank

medium

Complete the code to correctly start a PHP script.

PHP

[1]
// This is a PHP script
?>

Drag options to blanks, or click blank then click option'

A<?php

B<php>

C<script php>

D<?

Attempts:

3 left

💡 Hint

Common Mistakes

Using short tags like '

Using HTML script tags instead.

The correct way to start a PHP script is with <?php. This tells the server to process the code as PHP.

3fill in blank

hard

Fix the error in the code to correctly print 'Hello World'.

PHP

<?php
echo [1]Hello World[2];
?>

Drag options to blanks, or click blank then click option'

A'

C`

D"

Attempts:

3 left

💡 Hint

Common Mistakes

Leaving out quotes causes syntax errors.

Using backticks which are for shell commands.

Strings in PHP can be enclosed in double quotes " or single quotes '. Here, double quotes are used correctly to surround the string.

4fill in blank

hard

Fill both blanks to create a PHP script that prints 'Hello World' and ends correctly.

PHP

[1]
echo "Hello World";[2]

Drag options to blanks, or click blank then click option'

A<?php

B?>

C;

D//

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting the closing tag.

Using comments instead of closing tag.

The PHP script starts with <?php and ends with ?>. The semicolon ends the echo statement.

5fill in blank

hard

Fill all three blanks to create a PHP script that prints 'Hello World' with correct syntax.

PHP

[1]
echo [2]Hello World[3];

Drag options to blanks, or click blank then click option'

A<?php

B"

D'

Attempts:

3 left

💡 Hint

Common Mistakes

Using mismatched quotes.

Forgetting the opening tag.

The script starts with <?php. The string is enclosed in double quotes " on both sides. The semicolon ends the statement.

Practice

1. What does the echo statement do in a PHP program?

easy

A. It prints text or output to the screen.

B. It starts the PHP program.

C. It ends the PHP program.

D. It declares a variable.

Solution

1. Step 1: Understand the role of echo

   The echo statement is used in PHP to display text or output on the screen.

2. Step 2: Differentiate from other PHP parts

   Starting and ending PHP code uses <?php and ?>, not echo. Variables are declared differently.

3. Final Answer:

   It prints text or output to the screen. -> Option A

4. Quick Check:

   echo = print output [OK]

Hint: Remember echo means print output on screen [OK]

Common Mistakes:

• Confusing echo with PHP start tag
• Thinking echo ends the program
• Mixing echo with variable declaration

2. Which of the following is the correct way to start a PHP script?

easy

A. <script>

B. <php>

C. <?>

D. <?php

Solution

1. Step 1: Identify the PHP opening tag

   PHP scripts start with <?php to tell the server to process PHP code.

2. Step 2: Check other options

   <php> and <?> are invalid tags. <script> is for JavaScript, not PHP.

3. Final Answer:

   <?php -> Option D

4. Quick Check:

   PHP starts with <?php [OK]

Hint: PHP always starts with <?php tag [OK]

Common Mistakes:

• Using <php> instead of <?php
• Confusing PHP tags with HTML or JavaScript tags
• Omitting the PHP start tag

3. What will be the output of this PHP code?

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

medium

A. echo "Hello World!";

B. Hello World!

C. Syntax Error

D. No output

Solution

1. Step 1: Understand the echo statement

   The echo command prints the string inside quotes to the screen exactly as it is.

2. Step 2: Check the code syntax

   The code uses correct PHP tags and syntax, so it will output the string "Hello World!".

3. Final Answer:

   Hello World! -> Option B

4. Quick Check:

   echo prints "Hello World!" [OK]

Hint: echo prints text inside quotes directly [OK]

Common Mistakes:

• Expecting code to print the echo statement itself
• Missing semicolon causing syntax error
• Not using correct PHP tags

4. Find the error in this PHP code:

<?php
echo "Hello World!"
?>

medium

A. Incorrect quotes around text

B. Wrong PHP start tag

C. Missing semicolon after echo statement

D. Missing closing PHP tag

Solution

1. Step 1: Check the echo statement syntax

   In PHP, each statement must end with a semicolon. The echo line is missing it.

2. Step 2: Verify other parts

   The PHP start tag and quotes are correct. The closing PHP tag is optional but present.

3. Final Answer:

   Missing semicolon after echo statement -> Option C

4. Quick Check:

   Statements need semicolon [OK]

Hint: Always end PHP statements with a semicolon [OK]

Common Mistakes:

• Forgetting semicolon at end of statement
• Confusing PHP tags with HTML tags
• Using wrong quotes like single without closing

5. You want to write a PHP program that prints "Hello World!" and then prints "Welcome to PHP." on the next line. Which code is correct?

hard

A. <?php
echo "Hello World!";
echo "Welcome to PHP.";
?>

B. <?php
echo "Hello World!\nWelcome to PHP.";
?>

C. <?php
print "Hello World!" print "Welcome to PHP.";
?>

D. <?php
echo "Hello World!" echo "Welcome to PHP.";
?>

Solution

1. Step 1: Check syntax for multiple echo statements

   Each echo must end with a semicolon.

   <?php
   echo "Hello World!";
   echo "Welcome to PHP.";
   ?>

   correctly uses two echo statements with semicolons.

2. Step 2: Check other options for errors

   <?php
   echo "Hello World!\nWelcome to PHP.";
   ?>

   uses \n inside double quotes but PHP does not automatically print new lines in HTML output.

   <?php
   print "Hello World!" print "Welcome to PHP.";
   ?>

   misses semicolon between print statements.

   <?php
   echo "Hello World!" echo "Welcome to PHP.";
   ?>

   misses semicolon after first echo.

3. Final Answer:

   Two separate echo statements with semicolons -> Option A

4. Quick Check:

   Separate echo with semicolons for multiple lines [OK]

Hint: Use separate echo lines with semicolons for multiple outputs [OK]

Common Mistakes:

• Missing semicolons between statements
• Using print without semicolons
• Expecting \n to create new line in browser output