Mailgun Report via API using PHP

mailgunreport.php

<?php

require_once __DIR__ . '/../vendor/autoload.php';

/**
 * Get mailgun report
 *
 * @param string $url
 * @return array
 */
function getMailgunReport(string $url): array
{
    $client = new GuzzleHttp\Client();
    $response = $client->request(
        'GET',
        $url,
        [
            'auth' => ['api', 'key']
        ]
        );

    return json_decode($response->getBody(), true);
}

/**
 * Get all mailgun reports
 *
 * @param string $url
 * @param array $list
 * @return void
 */
function getAllMailgunReports(string $url, array &$list): void
{
    $results = getMailgunReport($url);
    foreach ($results['items'] as $email) {
        if (!array_key_exists(trim(strtolower($email['recipient'])), $list)) {
            $list[trim(strtolower($email['recipient']))] = trim($email['recipient']);
            echo strtolower($email['recipient']) . PHP_EOL;
        }
    }
    getAllMailgunReports($results['paging']['next'], $list);
}

getAllMailgunReports('https://api.mailgun.net/v3/{domain}/events?subject={search text}&limit=300', $list);

//run in console php mailgunreport.php > log.txt