Fibers for concurrency in PHP - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a Fiber in PHP?

A Fiber is a lightweight concurrency primitive that allows you to pause and resume code execution, enabling cooperative multitasking within a single thread.

beginner

How do you create and start a Fiber in PHP?

You create a Fiber by instantiating the Fiber class with a callable, then start it using the start() method, which runs the fiber until it suspends or finishes.

intermediate

What method do you use to pause a Fiber's execution?

You use the Fiber::suspend() method inside the fiber's callable to pause execution and optionally send a value back to the caller.

intermediate

How do you resume a suspended Fiber?

You call the resume() method on the Fiber instance, optionally passing a value that the fiber receives as the result of the suspend() call.

intermediate

Why are Fibers useful for concurrency in PHP?

Fibers let you write asynchronous code in a synchronous style by pausing and resuming tasks cooperatively, improving readability and control without using multiple threads.

Which PHP class is used to create a Fiber?

A Fiber

B Thread

C Coroutine

D Async

The Fiber class is the built-in PHP class used to create fibers for concurrency.

What method starts the execution of a Fiber?

A start()

B begin()

C run()

D execute()

The start() method begins the execution of a Fiber.

How does a Fiber pause its execution?

A Using yield

B Using Fiber::suspend()

C Using sleep()

D Using wait()

Fibers pause execution by calling Fiber::suspend() inside their callable.

What happens when you call resume() on a Fiber?

A It stops the Fiber

B It creates a new Fiber

C It restarts the Fiber from the beginning

D It continues execution from the last suspend point

Calling resume() continues the Fiber's execution from where it was suspended.

Fibers in PHP help achieve concurrency by:

A Using multiple processes

B Running multiple threads simultaneously

C Pausing and resuming code cooperatively in a single thread

D Automatically parallelizing code

Fibers allow cooperative multitasking by pausing and resuming code within a single thread.

Explain how Fibers enable concurrency in PHP and how you control their execution.

Think about how you can stop and start a task manually inside one thread.

Describe the lifecycle of a Fiber from creation to completion.

Consider the steps you take to run, pause, and finish a Fiber.