PHP 8.3 Fibers for Concurrent API Calls

Introduction When your application needs to call multiple external APIs — like fetching trending videos from 7 different regions — doing it sequentially is slow. PHP 8.1 introduced Fibers, and PHP 8.3 made them production-ready. Here's how I use Fibers on ViralVidVault to fetch data from multiple YouTube API endpoints concurrently. The Problem: Sequential API Calls // Sequential: ~7 seconds for 7 regions (1s each) foreach ([ 'US' , 'GB' , 'PL' , 'NL' , 'SE' , 'NO' , 'AT' ] as $region ) { $results [ $region ] = fetchTrending ( $region ); // ~1 second each } // Total: 7 * 1s = ~7 seconds The Solution: Fibers + curl_multi Fibers don't make I/O faster by themselves — they provide cooperative multitasking. Combined with curl_multi , they let you run multiple HTTP requests in parallel: <?php class ConcurrentFetcher { private array $fibers = []; private \CurlMultiHandle $multiHandle ; private array $handles = []; public function __construct () { $this -> multiHandle = curl_multi_init (); } pu