Class 'Geocoder\Provider\OpenCage\OpenCage' not found - php

Question

I'm trying to translate my long and lat from my html 5 location request into a readable adress. I'm trying to use openCage Geocoding for this but it keeps giving the nex error:
Class 'Geocoder\Provider\OpenCage\OpenCage' not found
this is my code, like the documentation said
<?php
require "vendor/autoload.php";
use Http\Adapter\Guzzle6\Client as GuzzleAdapter;
use Geocoder\Query\GeocodeQuery;
use Geocoder\Query\ReverseQuery;
$adapter = new GuzzleAdapter();
$provider = new \Geocoder\Provider\OpenCage\OpenCage($adapter, 'APIKEY');
$geocoder = new \Geocoder\StatefulGeocoder($provider, 'en');
$results = $geocoder->geocodeQuery(GeocodeQuery::create('1 Hacker Way, Menlo Park, 94025'));
# print_r($results);
$coords = $results->first()->getCoordinates();
echo json_encode([ 'lat' => $coords->getLatitude(), 'lon' => $coords->getLongitude() ]) . "\n";
?>

Answer 1

From the documentation you linked to:
There are two PHP libraries you can use
You have installed one and used the sample code from the other. So, either run this command:
composer require willdurand/geocoder
And keep using the code above.
Or, replace your code with something like this:
$geocoder = new \OpenCage\Geocoder\Geocoder('YOUR-API-KEY');
$result = $geocoder->geocode('1 Hacker Way, Menlo Park, 94025');
if ($result && $result['total_results'] > 0) {
$first = $result['results'][0];
echo json_encode([
'lat' => $first['geometry']['lat'],
'lon' => $first['geometry']['lng'],
]);
}