Comparison with long-running servers (Node.js) in PHP - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print a message in PHP.

PHP

<?php
 echo [1];
?>

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

A"Hello, world!"

Bprint("Hello, world!")

CHello, world!

Decho Hello, world!

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting quotes around the string

Using print() inside echo

In PHP, strings must be enclosed in quotes when using echo.

2fill in blank

medium

Complete the code to start a PHP built-in server on port 8000.

PHP

php -S [1]

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

A127.0.0.1:9000

Blocalhost:8080

C0.0.0.0:8000

Dlocalhost:8000

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong port number

Using IP instead of localhost

The built-in PHP server commonly runs on localhost:8000 by default.

3fill in blank

hard

Fix the error in the PHP code that tries to keep a long-running server alive.

PHP

<?php
while (true) {
    [1]("Server running...\n");
    sleep(5);
}
?>

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

Aprint

Becho

Cconsole.log

Dprintf

Attempts:

3 left

💡 Hint

Common Mistakes

Using JavaScript functions like console.log

Using print without parentheses

In PHP, echo is used to output text. console.log is JavaScript and will cause an error.

4fill in blank

hard

Fill both blanks to create a PHP script that listens on port 8080 and outputs a response.

PHP

<?php
$address = '127.0.0.1';
$port = [1];
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
socket_bind($socket, $address, $port);
socket_listen($socket);

$client = socket_accept($socket);
socket_write($client, [2]);
socket_close($client);
socket_close($socket);
?>

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

A8080

B"Hello from PHP server!"

C80

D"Welcome!"

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong port number

Not quoting the message string

Port 8080 is commonly used for testing servers. The message must be a string in quotes.

5fill in blank

hard

Fill all three blanks to create a PHP script that accepts a connection, reads data, and sends a response.

PHP

<?php
$address = '0.0.0.0';
$port = [1];
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
socket_bind($socket, $address, $port);
socket_listen($socket);

$client = socket_accept($socket);
$data = socket_read($client, [2]);
socket_write($client, [3]);
socket_close($client);
socket_close($socket);
?>

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

A9000

B1024

C"Data received"

D512

Attempts:

3 left

💡 Hint

Common Mistakes

Using too small or too large read size

Not quoting the response string

Port 9000 is a common test port. Reading 1024 bytes is typical. The response must be a quoted string.