C:/xampp/htdocs/moodle/lib/phpmailer/moodle_phpmailer.php

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<?php

// PLEASE NOTE: we use the phpmailer class _unmodified_
// through the joys of OO. Distros are free to use their stock
// version of this file.
require_once($CFG->libdir.'/phpmailer/class.phpmailer.php');

class moodle_phpmailer extends PHPMailer {

    public function __construct(){
        global $CFG;
        $this->Version   = 'Moodle '.$CFG->version;         // mailer version
        $this->PluginDir = $CFG->libdir.'/phpmailer/';      // plugin directory (eg smtp plugin)
        $this->CharSet   = 'UTF-8';
    }

    public function AddCustomHeader($custom_header) {
        if(preg_match('/message-id:(.*)/i', $custom_header, $matches)){
            $this->MessageID = $matches[1];
            return true;
        }else{
            return parent::AddCustomHeader($custom_header);
        }
    }

    public function EncodeHeader ($str, $position = 'text') {
        $textlib = textlib_get_instance();
        $encoded = $textlib->encode_mimeheader($str, $this->CharSet);
        if ($encoded !== false) {
            $encoded = str_replace("\n", $this->LE, $encoded);
            if ($position == 'phrase') {
                return ("\"$encoded\"");
            }
            return $encoded;
        }

        return parent::EncodeHeader($str, $position);
    }

    public static function RFCDate() {
        $tz = date('Z');
        $tzs = ($tz < 0) ? '-' : '+';
        $tz = abs($tz);
        $tz = (($tz - ($tz%3600) )/3600)*100 + ($tz%3600)/60; // fixed tz bug
        $result = sprintf("%s %s%04d", date('D, j M Y H:i:s'), $tzs, $tz);

        return $result;
    }

    public function EncodeQP($string, $line_max = 76, $space_conv = false) {
        //if (function_exists('quoted_printable_encode')) { //Use native function if it's available (>= PHP5.3)
        //    return quoted_printable_encode($string);
        //}
        $filters = stream_get_filters();
        if (!in_array('convert.*', $filters)) { //Got convert stream filter?
            return $this->EncodeQPphp($string, $line_max, $space_conv); //Fall back to old implementation
        }
        $fp = fopen('php://temp/', 'r+');
        $string = preg_replace('/\r\n?/', $this->LE, $string); //Normalise line breaks
        $params = array('line-length' => $line_max, 'line-break-chars' => $this->LE);
        $s = stream_filter_append($fp, 'convert.quoted-printable-encode', STREAM_FILTER_READ, $params);
        fputs($fp, $string);
        rewind($fp);
        $out = stream_get_contents($fp);
        stream_filter_remove($s);
        $out = preg_replace('/^\./m', '=2E', $out); //Encode . if it is first char on a line, workaround for bug in Exchange
        fclose($fp);
        return $out;
    }
}