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Informations about the package psr-for-wordpress

PSR for WordPress

License: GPL v3

A PSR implementation library for WordPress that bridges PSR interfaces to WordPress's native APIs. Currently implements:

Why This Package Exists

WordPress bundles its own HTTP transport (wp_remote_request). It handles proxies, SSL, redirects, and other platform-specific concerns automatically.

Libraries like omnipay/common, and others use php-http/discovery to auto-detect a PSR-18 HTTP client. Without this package, they'd pull in Guzzle — adding a heavy dependency and bypassing WordPress's HTTP layer.

This package gives you:

Requirements

Installation

Usage

Auto-discovery (Omnipay, php-http/discovery)

Add to your project's composer.json:

That's it. php-http/discovery will find Psr18Client automatically when any library calls Psr18ClientDiscovery::find().

Manual Usage

Custom Options

Global Timeout Override via WordPress Filter

Instead of manually configuring the client, use WordPress's native hook:

How It Works

Inside WordPress

When wp_remote_request() is available, the client calls it directly:

Outside WordPress

Install dependency using composer require rmccue/requests.

When wp_remote_request() is not available:

Exceptions

Exception Interface When Thrown
NetworkException Psr\Http\Client\NetworkExceptionInterface WP_Error or transport exception
RequestException Psr\Http\Client\RequestExceptionInterface Invalid request (e.g., empty URI)

Both exceptions implement getRequest() to retrieve the original PSR-7 request.

PSR-16 Simple Cache

Two adapters are provided, both implementing Psr\SimpleCache\CacheInterface:

Adapter WordPress Backend Persistence Best For
WpTransientsCache set_transient, get_transient Always persistent (DB by default, Redis if plugin) Tokens, API responses, settings that must survive requests
WpObjectCache wp_cache_set, wp_cache_get Only with Redis/Memcached plugin Query results, computed values reused within request

Usage

Companion Key Pattern — Storing false Correctly

WordPress returns false for both "key not found" and "value is false". We solve this by creating a companion key ({key}__found_psr16__) only when false is stored. Non-false values are stored raw — so native get_transient() can read them without mangling.

Feature This Package
False handling Companion key (only for false)
Native WordPress interop for non-false values ✅ Yes — values stored raw
Performance overhead Near-zero (companion keys created only for false values)

Guzzle vs This Package — Timeout Difference

Guzzle uses 0 as the default timeout, meaning no timeout at all. That's why Guzzle never fails for slow APIs. This package defaults to 10 seconds — which is more appropriate for production WordPress sites than WordPress's built-in 5-second default. Increase it as needed.

License

GPL-3.0-or-later. See LICENSE for full text.

All versions of psr-for-wordpress with dependencies

PHP Build Version
Package Version
Requires php Version >=8.1
nyholm/psr7 Version ^1.5
psr/http-client Version ^1.0
psr/http-factory Version ^1.0
psr/http-message Version ^1.1 || ^2.0
psr/simple-cache Version ^3.0
Composer command for our command line client (download client) This client runs in each environment. You don't need a specific PHP version etc. The first 20 API calls are free. Standard composer command

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