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PHP Async Frameworks

performance PHP 8.1+ Advanced

Also Known As

ReactPHP Amp PHP Revolt async PHP

TL;DR

ReactPHP and Amp provide event-loop async I/O — enabling concurrent HTTP requests without blocking.

Explanation

ReactPHP: event-driven, non-blocking I/O built on PHP streams. Amp v3: coroutine-based using PHP 8.1 Fibers. Both enable concurrent HTTP requests to multiple APIs simultaneously. Use where a service makes many external API calls — sequential calls taking N*latency become ~1*latency with concurrency.

Common Misconception

✗ ReactPHP replaces PHP-FPM for web apps — for typical web apps FPM is simpler; async shines for services making many concurrent I/O calls.

Why It Matters

PHP's traditional request-per-process model means concurrency is achieved through horizontal scaling — more server processes. Async frameworks like Swoole, ReactPHP, and RoadRunner change this by keeping a persistent event loop that handles many concurrent I/O operations in a single process. The performance gains are real for I/O-bound workloads but the programming model is fundamentally different — blocking calls stall the entire event loop, and PHP libraries written for synchronous execution often cannot be used directly without wrappers.

Common Mistakes

  • Blocking I/O inside async loop
  • Using sync PDO in async context
  • Not handling promise rejection
  • Async for sequential workflows

Code Examples

✗ Vulnerable 
foreach ($apis as $url) { $results[] = file_get_contents($url); } // 10s serial
✓ Fixed 
$browser = new Browser();
$promises = array_map(fn($u) => $browser->get($u), $apis);
\React\Promise\all($promises)->then(fn($r) => process($r));
Loop::run(); // ~1s
Added 16 Mar 2026
Edited 23 Mar 2026
Views 31

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Also referenced
Fibers (PHP 8.1) 57 PHP Concurrency Options 23 Swoole / OpenSwoole 23
How they use it
crawler 23 crawler_json 1
Related categories
php 6.3k performance 1.5k concurrency 780
⚡ DEV INTEL Tools & Severity
🔵 Info ⚙ Fix effort: High
⚡ Quick Fix
Choose ReactPHP for legacy code (EventEmitter-based, large ecosystem) or Amp v3 for modern PHP 8.1+ Fiber-based async/await syntax — both use the Revolt event loop
📦 Applies To
PHP 8.1+ cli queue-worker
🔗 Prerequisites
🔍 Detection Hints
Making 50+ sequential HTTP calls that could run concurrently; I/O-bound CLI script waiting serially for each operation
Auto-detectable: ✗ No blackfire
⚠ Related Problems
🤖 AI Agent
Confidence: Low False Positives: Medium ✗ Manual fix Fix: High Context: File Tests: Update
✓ schema.org compliant