Async php requests reactive responses with php fpm

asynchronous php requests and reactive responses with php-fpm: a deep dive

this tutorial will guide you through the process of creating asynchronous php requests and handling reactive responses using php-fpm. we'll explore different techniques, including event loops, message queues, and real-time communication, along with practical code examples. we'll focus on practical and manageable approaches that are best suited for the common use cases you might encounter when integrating with fpm.

**why asynchronous operations?**

php, by default, operates synchronously. this means that when a script makes a request (e.g., to an external api, database, or another part of your application), it waits for the response before continuing. this can lead to significant performance bottlenecks, especially when dealing with slow or unreliable resources.

asynchronous operations allow your php script to initiate a request and continue processing other tasks without waiting for the response. when the response finally arrives, a callback or event handler is triggered to process the data. this leads to increased responsiveness, improved resource utilization, and better overall application performance.

**limitations of php-fpm and "true" asynchronicity**

however, we can achieve *concurrency* and *pseudo-asynchronicity* by leveraging external tools and techniques. think of it more as "non-blocking" operations, where the php-fpm worker process doesn't have to actively wait for a long-running operation to complete.

**techniques for asynchronous operations with php-fpm**

here are the primary approaches we'll cover:

1. **message queues (recommended for robustness and scalability):** using message queues like rabbitmq or redis pub/ ...

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