This article explores how to interact with the Wunderlist API using PHP's Guzzle HTTP client. Wunderlist, a popular task management application, offers an API allowing developers to manage tasks programmatically. This guide demonstrates basic CRUD (Create, Read, Update, Delete) operations.

Key Concepts:

• Wunderlist API: Provides methods to create, read, update, and delete tasks within Wunderlist.
• Guzzle: A PHP HTTP client simplifying API interactions by handling HTTP requests.
• Authentication: Requires creating a Wunderlist application and obtaining an access token.
• Error Handling: Utilizing exception handling within Guzzle to manage HTTP errors.

The Wunderlist API, publicly available since 2015, empowers developers to integrate task management into their applications. This tutorial uses a straightforward PHP approach (without frameworks) and Composer for dependency management. Since there's no official PHP SDK, we leverage Guzzle. A companion demo repository (link provided in original text) showcases a basic implementation with Ajax for task checking.

Setting up the Development Environment:

A composer.json file manages dependencies:

{
    "require": {
        "php": ">=5.5.0",
        "guzzlehttp/guzzle": "~6.0"
    },
    "autoload": {
        "psr-4": {
            "Wunderlist\": "src/"
        }
    },
    "require-dev": {
        "symfony/var-dumper": "~2.7"
    }
}

Create a src/ directory for your PHP classes. Three files are needed: index.php (for API interaction), keys.php (storing API credentials – .gitignore this file!), and .gitignore (to exclude vendor/ and keys.php). .gitignore should contain:

<code>vendor/*
keys.php</code>

Wunderlist Application Setup:

Before coding, create a new application in your Wunderlist account. Provide a dummy App URL and App callback URL (OAuth details are omitted for brevity). Crucially, generate an admin access token—this authenticates your application.

The WunderlistClient Class:

The keys.php file stores your client_id and access_token:

<?php
$client_id = 'your-client-id';
$access_token = 'your-access-token';
?>

The WunderlistClient class (in src/WunderlistClient.php) handles API requests:

<?php

namespace Wunderlist;

use GuzzleHttp\ClientInterface;
use Psr\Http\Message\ResponseInterface;

class WunderlistClient {
    private $client;

    public function __construct(ClientInterface $client) {
        $this->client = $client;
    }

    // ... methods for getLists(), getList(), getListTasks(), createTask(), completeTask() ...  (See below for examples)

    private function checkResponseStatusCode(ResponseInterface $response, $expectedStatusCode) {
        $statusCode = $response->getStatusCode();
        if ($statusCode !== $expectedStatusCode) {
            throw new \RuntimeException('Wunderlist API returned status code ' . $statusCode . ' expected ' . $expectedStatusCode);
        }
    }
}

index.php Example (using WunderlistClient):

require 'vendor/autoload.php';
require_once 'keys.php';

use GuzzleHttp\Client;
use Wunderlist\WunderlistClient;

$guzzle = new Client([
    'base_uri' => 'https://a.wunderlist.com/api/v1/',
    'headers' => [
        'Content-Type' => 'application/json',
        'X-Client-ID' => $client_id,
        'X-Access-Token' => $access_token,
    ]
]);

$wunderlist = new WunderlistClient($guzzle);

try {
    $lists = $wunderlist->getLists();
    // Process $lists
} catch (\Exception $e) {
    // Handle exceptions
}

Example Methods for WunderlistClient (Illustrative):

{
    "require": {
        "php": ">=5.5.0",
        "guzzlehttp/guzzle": "~6.0"
    },
    "autoload": {
        "psr-4": {
            "Wunderlist\": "src/"
        }
    },
    "require-dev": {
        "symfony/var-dumper": "~2.7"
    }
}

Remember to replace placeholder values with your actual client_id and access_token. Implement other CRUD methods similarly, referencing the Wunderlist API documentation. The complete code, including error handling and more advanced features, would be significantly longer. This provides a skeletal structure to get started. Consult the Wunderlist API documentation for details on specific endpoints and request parameters.

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