Config Wordpress SMTP for MailHog - test your emails local

wp-mailhog-config-smtp.php

/*
   * Add the MailHog to your wordpress projects
   * By Khalid Ahmada
   * MailHog @see https://github.com/mailhog/MailHog
   */

  class WP_MAILHOG
  {

    function __construct()
    {
      // Config only on local
      if ($this->isLocal()) {
        $this->AddSMTP();
      }

    }


    /**
     * Config Your local rule
     * default is check if the host is *.test or  *.local
     * @return bool
     */
    private function isLocal()
    {

      if (defined('WP_HOME')) {
        if (strpos(WP_HOME, '.test') !== false ||
          strpos(WP_HOME, '.local') !== false
        ) {
          return true;
        }
      }

      return false;

    }

    /*
     * Wordpress default hook to config php mail
     */
    private function AddSMTP()
    {
      add_action('phpmailer_init', array($this, 'configEmailSMTP'));
    }


    /*
     * Config MailTramp SMTP
     */
    public function configEmailSMTP(PHPMailer $phpmailer)
    {
      $phpmailer->IsSMTP();
      $phpmailer->Host='127.0.0.1';
      $phpmailer->Port=1025;
      $phpmailer->Username='';
      $phpmailer->Password='';
      $phpmailer->SMTPAuth=true;

    }
  }

  new WP_MAILHOG();

This is my snippet based on MailHog you need first to install MailHog and then configure it just need the add the next snippet into your functions.php

https://gist.github.com/khalidahmada/74c3ba52e7d179e323b30d97f4847ec6

Please note that you need the configure your rule that checks if turn on local or not by default rule tests the constant 'WP_HOME' into your wp-config.php if contains 'test' or 'local' either that you need to specify your own role rule the function in the snippet it's isLocal()

Thanks for the snippet, but it gives me following error:
PHP Fatal error: Uncaught TypeError: WP_MAILHOG::configEmailSMTP(): Argument #1 ($phpmailer) must be of type PHPMailer, PHPMailer\PHPMailer\PHPMailer given

Just found the solution:

    public function configEmailSMTP(PHPMailer\PHPMailer\PHPMailer $phpmailer)
    {
        $phpmailer->IsSMTP();
        $phpmailer->Host = '127.0.0.1';
        $phpmailer->Port = 1025;
        $phpmailer->Username = '';
        $phpmailer->Password = '';
        $phpmailer->SMTPAuth = true;
    }