How a PHP request starts and ends - Try It Yourself

How a PHP request starts and ends

📖 Scenario: Imagine you are learning how a PHP script runs when a web server receives a request. You want to see the basic flow of a PHP request from start to finish.

🎯 Goal: You will create a simple PHP script that shows the start and end of a PHP request by printing messages at the beginning and the end of the script.

📋 What You'll Learn

Create a PHP script that prints a start message

Add a configuration variable to hold the request name

Use the configuration variable in the main logic to print a message

Print an end message to show the request finished

💡 Why This Matters

🌍 Real World

Web servers use PHP scripts to handle requests from users visiting websites. Understanding the start and end of a PHP request helps you see how your code runs.

💼 Career

Many web developer jobs require knowledge of PHP request flow to build and debug web applications.

1

Start the PHP request with a message

Write a PHP script that prints the message "Request started" at the very beginning using echo.

PHP

<?php

// Print "Request started" message
// Your code here

Hint

Use echo to print text in PHP. Remember to include a newline character \n for clarity.

2

Add a configuration variable for the request name

Add a variable called $requestName and set it to the string "HomePage".

PHP

<?php

echo "Request started\n";

// Create a variable $requestName with value "HomePage"
// Your code here

Hint

Use $requestName = "HomePage"; to create the variable.

3

Use the request name in the main logic

Write a line that prints "Processing request: HomePage" using the variable $requestName and echo.

PHP

<?php

echo "Request started\n";

$requestName = "HomePage";

// Print "Processing request: HomePage" using $requestName
// Your code here

Hint

Use double quotes and include the variable inside the string to print it.

4

Print the end message to finish the request

Add a line that prints "Request ended" using echo to show the PHP request finished.

PHP

<?php

echo "Request started\n";

$requestName = "HomePage";

echo "Processing request: $requestName\n";

// Print "Request ended" message
// Your code here

Hint

Use echo "Request ended\n"; to print the end message.

Practice

1. What marks the beginning of PHP code in a file?

easy

A. The <php> tag

B. The <script> tag

C. The <?php tag

D. The <?> tag

Solution

1. Step 1: Identify PHP opening tag

   PHP code always starts with the <?php tag to tell the server to process PHP.

2. Step 2: Compare with other tags

   Other tags like <script> are for JavaScript, and <php> is invalid.

3. Final Answer:

   The <?php tag -> Option C

4. Quick Check:

   PHP starts with <?php [OK]

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

Common Mistakes:

• Confusing PHP tags with HTML or JavaScript tags
• Using short tags like which may be disabled
• Thinking PHP starts with ? or other symbols

2. Which of the following correctly ends a PHP block?

easy

A. ?>

B. </php>

C. <?php

D. <?>

Solution

1. Step 1: Identify PHP closing tag

   The PHP block ends with ?> to signal the end of PHP code.

2. Step 2: Validate other options

   </php> is invalid HTML, <?php starts PHP, and <?> is not a valid closing tag.

3. Final Answer:

   ?> -> Option A

4. Quick Check:

   PHP ends with ?> [OK]

Hint: PHP ends with ?> tag to close code block [OK]

Common Mistakes:

• Using HTML closing tags like
• Confusing PHP start and end tags
• Omitting the closing tag when mixing PHP and HTML

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

<?php
echo 'Hello';
?>

medium

A. Hello

B. <?php echo 'Hello'; ?>

C. Syntax Error

D. No output

Solution

1. Step 1: Understand PHP code execution

   The PHP code inside <?php ?> runs on the server and outputs the string 'Hello'.

2. Step 2: Check output behavior

   The echo statement prints 'Hello' to the page, so the output is exactly that.

3. Final Answer:

   Hello -> Option A

4. Quick Check:

   echo 'Hello' outputs Hello [OK]

Hint: echo prints text inside PHP tags to the page [OK]

Common Mistakes:

• Expecting PHP code to show as text in browser
• Confusing PHP tags with HTML tags
• Thinking PHP code causes syntax error without semicolon

4. Identify the error in this PHP snippet:

<?php
echo 'Hi'
?>

medium

A. Incorrect PHP start tag

B. Using single quotes instead of double quotes

C. Missing closing PHP tag

D. Missing semicolon after echo statement

Solution

1. Step 1: Check PHP syntax rules

   Each PHP statement must end with a semicolon; here, echo 'Hi' lacks it.

2. Step 2: Validate other parts

   The start tag <?php and closing tag ?> are correct; single quotes are valid in PHP.

3. Final Answer:

   Missing semicolon after echo statement -> Option D

4. Quick Check:

   Statements need semicolon [OK]

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

Common Mistakes:

• Forgetting semicolon at end of statements
• Thinking PHP tags are case-sensitive
• Assuming quotes type causes syntax error

5. Which statement best describes how a PHP request lifecycle works?

hard

A. PHP code runs once when the server starts and stays in memory

B. Each request runs PHP code fresh, then ends after sending response

C. PHP code runs only if the closing tag is omitted

D. PHP code runs continuously until manually stopped

Solution

1. Step 1: Understand PHP request lifecycle

   PHP runs code fresh on each page request, processes it, then ends after sending the response.

2. Step 2: Evaluate other options

   PHP does not run continuously or stay in memory; closing tag presence does not control execution.

3. Final Answer:

   Each request runs PHP code fresh, then ends after sending response -> Option B

4. Quick Check:

   PHP runs per request, then ends [OK]

Hint: PHP runs fresh on each request, then stops [OK]

Common Mistakes:

• Thinking PHP code runs persistently like a service
• Believing PHP runs only if closing tag is missing
• Assuming PHP code stays loaded between requests