What is PHP - Interactive Quiz & Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print "Hello, World!" in PHP.

PHP

<?php
echo [1];
?>

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

A"Hello, World!"

BHello, World!

C'Hello World'

DHello World

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting quotes around the text causes errors.

Using unquoted text is treated as a constant, causing errors.

In PHP, strings must be enclosed in quotes. Using double quotes "Hello, World!" prints the exact text.

2fill in blank

medium

Complete the code to declare a variable named $name with the value "Alice".

PHP

<?php
[1] = "Alice";
?>

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

Aname

B$name

Cvar name

Dlet name

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting the $ sign before variable names.

Using JavaScript style variable declarations like var or let.

In PHP, variables start with a dollar sign $. So $name is the correct variable name.

3fill in blank

hard

Fix the error in the PHP code to correctly concatenate two strings.

PHP

<?php
$greeting = "Hello" [1] " World!";
echo $greeting;
?>

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

A+

B&&

C&

D.

Attempts:

3 left

💡 Hint

Common Mistakes

Using + instead of . for string concatenation.

Using logical operators like & or && by mistake.

In PHP, the dot (.) operator is used to join strings together.

4fill in blank

hard

Fill both blanks to create an associative array with keys "name" and "age".

PHP

<?php
$person = array([1] => "Bob", [2] => 30);
?>

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

A"name"

B"age"

Cname

Dage

Attempts:

3 left

💡 Hint

Common Mistakes

Using unquoted keys which are treated as constants.

Mixing keys with and without quotes.

Array keys must be strings in quotes. So use "name" and "age" as keys.

5fill in blank

hard

Fill all three blanks to write a PHP function named greet that takes a $name and returns a greeting string.

PHP

<?php
function [1]([2]) {
    return "Hello, " . [3] . "!";
}
?>

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

Agreet

B$name

Dhello

Attempts:

3 left

💡 Hint

Common Mistakes

Using variable names without $ inside the function.

Naming the function with a $ sign.

Using different names for parameter and inside variable.

The function name is greet. The parameter and variable used inside must be $name with the $ sign.

Practice

1. What is PHP mainly used for?

easy

A. Designing static images

B. Editing videos

C. Writing desktop applications

D. Creating dynamic and interactive websites

Solution

1. Step 1: Understand PHP's purpose

   PHP is a language designed to create dynamic content on websites, making them interactive.

2. Step 2: Compare options

   Only Creating dynamic and interactive websites matches PHP's main use; others relate to different fields.

3. Final Answer:

   Creating dynamic and interactive websites -> Option D

4. Quick Check:

   PHP = Dynamic websites [OK]

Hint: PHP is for web interaction, not static or media tasks [OK]

Common Mistakes:

• Thinking PHP edits images or videos
• Confusing PHP with desktop app languages

2. Which of these is the correct way to start PHP code in a file?

easy

A. <?php

B. <script>

C. <php>

D. <?html>

Solution

1. Step 1: Recall PHP opening tags

   PHP code starts with <?php to tell the server to run PHP.

2. Step 2: Check other tags

   <script> is for JavaScript, <php> and <?html> are invalid.

3. Final Answer:

   <?php -> Option A

4. Quick Check:

   PHP code starts with <?php [OK]

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

Common Mistakes:

• Using <script> instead of PHP tags
• Writing <php> which is not valid

3. What will this PHP code output?

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

medium

A. Syntax Error

B. Hello, World!

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

D. Nothing

Solution

1. Step 1: Understand echo statement

   The echo command prints the text inside quotes to the browser.

2. Step 2: Check code correctness

   The code is correct PHP syntax and will output the string exactly.

3. Final Answer:

   Hello, World! -> Option B

4. Quick Check:

   echo prints text = Hello, World! [OK]

Hint: echo prints text inside quotes [OK]

Common Mistakes:

• Expecting PHP code to show as text
• Thinking code causes error without semicolon

4. Find the error in this PHP code:

<?php
 echo "Welcome to PHP!"
?>

medium

A. Echo cannot print strings

B. Wrong opening PHP tag

C. Missing semicolon after echo statement

D. Quotes should be single quotes

Solution

1. Step 1: Check PHP syntax rules

   Each statement must end with a semicolon to separate commands.

2. Step 2: Identify missing semicolon

   The echo line lacks a semicolon at the end, causing a syntax error.

3. Final Answer:

   Missing semicolon after echo statement -> Option C

4. Quick Check:

   Statements end with ; = Missing semicolon [OK]

Hint: Every PHP statement ends with a semicolon [OK]

Common Mistakes:

• Ignoring semicolon at line end
• Thinking double quotes cause error

5. You want to create a PHP page that shows the current year dynamically. Which code snippet correctly does this?

hard

A. <?php echo date('Y'); ?>

B. <?php print currentYear(); ?>

C. <?php echo 'year'; ?>

D. <?php showYear(); ?>

Solution

1. Step 1: Identify PHP function for current year

   The built-in function date('Y') returns the current year as a string.

2. Step 2: Check code snippets

   Only <?php echo date('Y'); ?> uses date('Y') correctly with echo to print the year.

3. Final Answer:

   <?php echo date('Y'); ?> -> Option A

4. Quick Check:

   date('Y') prints year = <?php echo date('Y'); ?> [OK]

Hint: Use date('Y') to get current year in PHP [OK]

Common Mistakes:

• Using undefined functions like currentYear()
• Printing literal strings instead of function output