🍤 Caridea is a miniscule PHP application library. This is a shrimpy HTTP utility library.
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Caridea is a miniscule PHP application library. This shrimpy fellow is what you'd use when you just want some helping hands and not a full-blown framework.

This is its HTTP component. It includes small utilities for working with PSR-7 HTTP requests and responses, including:

  • An implementation of RFC 7807, "Problem Details for HTTP APIs".
  • A utility to parse common pagination parameters from the request
  • A utility to correctly parse query strings with multiple parameters having the same name
  • A utility to determine a client's preferred accepted MIME type

Packagist Build Status Scrutinizer Code Quality Code Coverage Documentation Status


You can install this library using Composer:

$ composer require caridea/http
  • The master branch (version 3.x) of this project requires PHP 7.1 and depends on psr/http-message.
  • Version 2.x of this project requires PHP 7.0 and depends on psr/http-message.
  • Version 1.x of this project requires PHP 5.5 and depends on psr/http-message.


Releases of this library will conform to Semantic Versioning.

Our code is intended to comply with PSR-1, PSR-2, and PSR-4. If you find any issues related to standards compliance, please send a pull request!



Just a few quick examples.

Problem Details

We included an implementation of RFC 7807 that you can serialize to JSON or append to a PSR-7 HTTP Response.

use Caridea\Http\ProblemDetails;
use Zend\Diactoros\Uri;

$problem = new ProblemDetails(
    new Uri('http://example.com/problem/oops'),  // type
    'A weird thing happened',                    // title
    500,                                         // status
    'It looks like the server has goofed again', // detail
    new Uri('http://example.com/problems/1f9a'), // instance
    [                                            // extensions
        'server' => 'workerbee01.example.com',
        'auth' => 'foobar'
echo json_encode($problem);

Pagination Factory

use Zend\Diactoros\ServerRequestFactory;

$request = ServerRequestFactory::fromGlobals(
    \Caridea\Http\QueryParams::getFromServer(), // instead of $_GET

$factory = new \Caridea\Http\PaginationFactory();

// say the Query was ?count=25&startIndex=1&sort=%2Bfoo&sort-bar
// or maybe          ?count=25&start=0&sort=%2Bfoo,-bar
// or one of many other formats for this type of pagination settingns
$pagination = $factory->create($request, 'sort');
$pagination->getMax();    // 25
$pagination->getOffset(); // 0
$pagination->getOrder();  // ['foo' => true, 'bar' => false]

Accept Types

// say the HTTP_ACCEPT field is text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
$types = new \Caridea\Http\AcceptTypes($_SERVER);
$types->preferred(['application/xml', 'application/json']); // returns application/xml

Helper Traits

Two traits are now available, JsonHelper and MessageHelper. These can be used by controller classes or dispatcher middleware.


The traits JsonHelper and MessageHelper (as well as their unit tests) were ported to PHP from the Labrys library under a compatible Apache 2.0 license.