Send errors via email

Can anyone tell me how I can get Codeigniter 3 to send details of errors via email. I have found a few examples for older versions none of which work.

I believe those should still work for CI3. Did it work for you in CI2? If you did not try it in CI2, it's not a problem of CI3, but rather smtp settings. If yes, explain in more detail how it does not work. No errors?

Not tried in CI2 but others had used it and it worked for them in CI2 but I cant find any code for CI3. I have now tried various examples but none worked so far, the latest code below looks to be o.k. but is giving an error 'Notice: Trying to get property of non-object' when trying to load the config but I cant figure out why.

PHP Code:

class MY_Exceptions extends CI_Exceptions {
    
    protected $CI;
    
    public function __construct()
    {
            // Assign the CodeIgniter super-object
            $this->CI =& get_instance();
    }

    public function log_exception($severity, $message, $filepath, $line)
    {

        // this allows different params for different environments
        $this->CI->config->load('email_php_errors');

        // if it's enabled
        if (config_item('email_php_errors'))
        {
            // set up email with config values
             $this->CI->load->library('email');
             $this->CI->email->from(config_item('php_error_from'));
             $this->CI->email->to(config_item('php_error_to'));

            // set up subject
            $subject = config_item('php_error_subject');
            $subject = $this->_replace_short_tags($subject, $severity, $message, $filepath, $line);
             $this->CI->email->subject($subject);

            // set up content
            $content = config_item('php_error_content');
            $content = $this->_replace_short_tags($content, $severity, $message, $filepath, $line);

            // set message and send
             $this->CI->email->message($content);
             $this->CI->email->send();
        }

        // do the rest of the codeigniter stuff
        parent::log_exception($severity, $message, $filepath, $line);
    }

    private function _replace_short_tags($content, $severity, $message, $filepath, $line)
    {
        $content = str_replace('{{severity}}', $severity, $content);
        $content = str_replace('{{message}}', $message, $content);
        $content = str_replace('{{filepath}}', $filepath, $content);
        $content = str_replace('{{line}}', $line, $content);

        return $content;
    }

}