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Server: Apache/2.4.52 (Ubuntu)
System: Linux spn-python 5.15.0-89-generic #99-Ubuntu SMP Mon Oct 30 20:42:41 UTC 2023 x86_64
User: arjun (1000)
PHP: 8.1.2-1ubuntu2.20
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File: /var/www/html/appointmentbook.me/wp-content/plugins/fluent-smtp/boot.php
<?php

!defined('WPINC') && die;

define('FLUENTMAIL', 'fluentmail');
define('FLUENTMAIL_PLUGIN_VERSION', '2.2.80');
define('FLUENTMAIL_UPLOAD_DIR', '/fluentmail');
define('FLUENT_MAIL_DB_PREFIX', 'fsmpt_');
define('FLUENTMAIL_PLUGIN_URL', plugin_dir_url(__FILE__));
define('FLUENTMAIL_PLUGIN_PATH', plugin_dir_path( __FILE__ ));

spl_autoload_register(function($class) {
    $match = 'FluentMail';

    if (!preg_match("/\b{$match}\b/", $class)) {
        return;
    }

    $path = plugin_dir_path(__FILE__);
    
    $file = str_replace(
        ['FluentMail', '\\', '/App/', '/Includes/'],
        ['', DIRECTORY_SEPARATOR, 'app/', 'includes/'],
        $class
    );

    require(trailingslashit($path) . trim($file, '/') . '.php');
});