Fibers for concurrency in PHP - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a new Fiber.

PHP

<?php
$fiber = new \Fiber(function() {
    echo [1];
});
$fiber->start();
?>

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

A"Hello from Fiber!"

BHello from Fiber!

Cprint("Hello")

Decho 'Hello'

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting quotes around the string

Using print instead of echo inside the Fiber

Passing a non-string value to echo

The Fiber function should echo a string. The string must be quoted properly in PHP.

2fill in blank

medium

Complete the code to start the Fiber and get its return value.

PHP

<?php
$fiber = new \Fiber(function() {
    return 42;
});
$result = $fiber->[1]();
echo $result;
?>

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

Astart

Brun

Cbegin

Dresume

Attempts:

3 left

💡 Hint

Common Mistakes

Using resume() before start()

Using a non-existent method like run() or begin()

To start a Fiber and get its return value, use the start() method.

3fill in blank

hard

Fix the error in the Fiber code to yield a value and resume it.

PHP

<?php
$fiber = new \Fiber(function() {
    $value = Fiber::[1](10);
    echo "Received: $value";
});
$fiber->start();
$fiber->resume(20);
?>

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

Apause

Bsuspend

Cyield

Dstop

Attempts:

3 left

💡 Hint

Common Mistakes

Using yield instead of suspend

Using pause or stop which do not exist

The Fiber::suspend() method pauses the Fiber and sends a value outside.

4fill in blank

hard

Fill both blanks to create a Fiber that suspends and resumes with values.

PHP

<?php
$fiber = new \Fiber(function() {
    $value = Fiber::[1]('start');
    echo "Resumed with: $value";
});
$fiber->[2]();
$fiber->resume('resume');
?>

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

Asuspend

Bstart

Cresume

Dbegin

Attempts:

3 left

💡 Hint

Common Mistakes

Using resume() to start the Fiber

Using start() instead of suspend() inside the Fiber

Use Fiber::suspend() to pause and send a value, and start() to begin the Fiber.

5fill in blank

hard

Fill all three blanks to create a Fiber that exchanges values twice.

PHP

<?php
$fiber = new \Fiber(function() {
    $value1 = Fiber::[1]('first');
    echo "Got: $value1\n";
    $value2 = Fiber::[2]('second');
    echo "Got: $value2\n";
    return 'done';
});

$result = $fiber->[3]();
echo "Result: $result";
?>

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

Asuspend

Bresume

Cstart

Dbegin

Attempts:

3 left

💡 Hint

Common Mistakes

Using resume() inside the Fiber instead of suspend()

Using begin() which does not exist

Using resume() to start the Fiber

Inside the Fiber, use suspend() twice to pause and send values. Use start() to begin the Fiber.