Guzzle, an extensible PHP HTTP client
HTTPlug, the HTTP client abstraction for PHP
Requests for PHP is a humble HTTP request library. It simplifies how you interact with other sites and takes away all your worries.
PHP Curl Class makes it easy to send HTTP requests and integrate with web APIs
Common HTTP Client implementations and tools for HTTPlug
A developer-experience focused HTTP client, optimized for most common use cases.
Unirest in PHP: Simplified, lightweight HTTP client library.
Simple handler system used to power clients and servers in PHP (this project is no longer used in Guzzle 6+)