First commit

composer.json

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+{
+    "require": {
+        "php": "^7.0",
+        "guzzlehttp/guzzle": "^6.3"
+    },
+    "autoload": {
+        "psr-4": { 
+            "DuckDuckGo\\": "src/DuckDuckGo/"
+        }
+    }
+}

config.php

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+<?php
+
+return [
+    /*
+    | Whether to use HTTPS or not. This defaults to true for security reasons (use HTTPS).
+    | Default: true.
+    | Options: true, false.
+    */
+    "https" => true,
+
+    /*
+    | Use JSON or XML format
+    | Default: "json".
+    | Options: "xml", "json".
+    */
+    "format" => "json",
+
+    /*
+    | Whether or not to skip Disambiguation results
+    | Default: true.
+    | Options: true, false.
+    */
+    "skip_disambiguations" => false,
+
+    /*
+    | Whether to disallow HTML in the result.
+    | Default: false.
+    | Options: true, false.
+    */
+    "html" => false,
+];

src/DuckDuckGo/Api.php

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+<?php
+
+namespace DuckDuckGo;
+
+use DuckDuckGo\Misc;
+use GuzzleHttp\Client as Http;
+use GuzzleHttp\Exception\ClientException;
+use GuzzleHttp\Exception\ServerException;
+
+Class Api
+{
+    /**
+     * Api endpoint url.
+     * 
+     * @var string
+     */
+    protected $endpoint;
+
+    /**
+     * DuckDuckGo Api constructor.
+     */
+    public function __construct()
+    {
+        $this->endpoint = "api.duckduckgo.com/";
+    }
+
+    /**
+     * Perform a query against the DuckDuckGo API.
+     * 
+     * @param  string $query
+     * @throws Exception
+     * @return Json
+     */
+    public function zeroClickQuery(string $query)
+    {
+        $url = $this->buildUrl($query);
+        $http = new Http();
+        try {
+            $response = $http->request("GET", $url);
+            return $response->getBody();
+        } catch (ClientException $e) {
+            throw new Exception($e->getResponse()->getBody(), $e->getResponse()->getStatusCode());
+        } catch (ServerException $e) {
+            throw new Exception("Could not retrieve API result.", 503);
+        }
+    }
+
+    /**
+     * Build a url with config parameters and query.
+     * 
+     * @param string $query
+     * @return string $url
+     */
+    public function BuildUrl(string $query)
+    {
+        $misc = new Misc();
+
+        $parameters = [
+            "q" => urlencode($query),
+            "format" => $misc->getConfig("format"),
+            "no_html" => $misc->getConfig("html"),
+            "no_redirect" => 1,
+            "skip_disambig" => $misc->getConfig("disambiguations"),
+        ];
+
+        $url = ($misc->getConfig("https")) 
+            ? "https://".$this->endpoint."?"
+            : "https://".$this->endpoint."?";
+
+        $url .= http_build_query($parameters);
+        return $url;
+    }
+}

src/DuckDuckGo/Misc.php

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+<?php
+
+namespace DuckDuckGo;
+
+class Misc
+{
+    /**
+     * Path of config.php file
+     * 
+     * @var string
+     */
+    private $configPath;
+
+    /**
+     * DuckDuckGo Misc constructor.
+     */
+    public function __construct()
+    {
+        $this->configPath = realpath(__DIR__ . '/../../config.php');
+    }
+
+    /**
+     * Retrieve information of config.php file based on key parameter.
+     * 
+     * @param string $key
+     * @return string|bool
+     */
+    public function getConfig($key)
+    {
+        $config = require($this->configPath);
+        return (isset($config[$key])) ? $config[$key] : false;
+    }
+}