PHP Fiber: Lifecycle and Error Handling

A Fiber moves through not-started, running, suspended and terminated states, with errors propagated to its resumer.

The examples below begin with the core behavior, then move to an application-oriented use.

How PHP Fiber: Lifecycle and Error Handling Works

A Fiber moves through not-started, running, suspended and terminated states, with errors propagated to its resumer.

Example 1: Basic Usage

This example uses a small input to make the main behavior visible.

<?php

$fiber = new Fiber(fn() => Fiber::suspend("paused"));
var_dump($fiber->isStarted());
$fiber->start();
var_dump($fiber->isSuspended());

Output:

bool(false)
bool(true)

A Fiber moves through not-started, running, suspended and terminated states, with errors propagated to its resumer.

Example 2: A Different Input

A different set of values shows the same operation in another situation.

<?php

$fiber = new Fiber(function (): void { try { Fiber::suspend("ready"); } catch (LogicException $error) { echo $error->getMessage(); } });
$fiber->start();
$fiber->throw(new LogicException("canceled"));

Output:

canceled

Calling resume() in the wrong state raises an exception; a Fiber that throws is terminated.

Practical Example: Applying the Feature

This example shows an application-style use of the feature, with its surrounding setup visible.

<?php

$fiber = new Fiber(function (): void { try { Fiber::suspend("paused"); } finally { echo "cleaned"; } });
$fiber->start();
$fiber->resume();

Output:

cleaned

The code is shown for learning. Adjust the class names, inputs and error handling to suit your application.

Important Behavior and Edge Cases

• Calling resume() in the wrong state raises an exception; a Fiber that throws is terminated.
• A Fiber moves through not-started, running, suspended and terminated states, with errors propagated to its resumer.
• Observe differences in empty inputs, invalid states and optional extension availability where relevant.

Comparison With Related Approaches

Common Beginner Mistakes

Key Takeaways

• A Fiber moves through not-started, running, suspended and terminated states, with errors propagated to its resumer.
• Calling resume() in the wrong state raises an exception; a Fiber that throws is terminated.
• Use the example that matches the values, runtime version and dependencies in your application.

PHP Fiber: Lifecycle and Error Handling is useful when its behavior matches the data structure and lifecycle of your PHP application. Choose it with a clear understanding of its preconditions and returned values.