PHPMailer\PHPMailer\PHPMailer::wrapText PHP Method

wrapText() public method

For use with mailers that do not automatically perform wrapping and for quoted-printable encoded messages. Original written by philippe.
public wrapText ( string $message, integer $length, boolean $qp_mode = false ) : string
$message string The message to wrap
$length integer The line length to wrap to
$qp_mode boolean Whether to run in Quoted-Printable mode
return string
    public function wrapText($message, $length, $qp_mode = false)
    {
        if ($qp_mode) {
            $soft_break = sprintf(' =%s', $this->LE);
        } else {
            $soft_break = $this->LE;
        }
        // If utf-8 encoding is used, we will need to make sure we don't
        // split multibyte characters when we wrap
        $is_utf8 = strtolower($this->CharSet) == 'utf-8';
        $lelen = strlen($this->LE);
        $crlflen = strlen(self::CRLF);
        $message = $this->fixEOL($message);
        //Remove a trailing line break
        if (substr($message, -$lelen) == $this->LE) {
            $message = substr($message, 0, -$lelen);
        }
        //Split message into lines
        $lines = explode($this->LE, $message);
        //Message will be rebuilt in here
        $message = '';
        foreach ($lines as $line) {
            $words = explode(' ', $line);
            $buf = '';
            $firstword = true;
            foreach ($words as $word) {
                if ($qp_mode and strlen($word) > $length) {
                    $space_left = $length - strlen($buf) - $crlflen;
                    if (!$firstword) {
                        if ($space_left > 20) {
                            $len = $space_left;
                            if ($is_utf8) {
                                $len = $this->utf8CharBoundary($word, $len);
                            } elseif (substr($word, $len - 1, 1) == '=') {
                                $len--;
                            } elseif (substr($word, $len - 2, 1) == '=') {
                                $len -= 2;
                            }
                            $part = substr($word, 0, $len);
                            $word = substr($word, $len);
                            $buf .= ' ' . $part;
                            $message .= $buf . sprintf('=%s', self::CRLF);
                        } else {
                            $message .= $buf . $soft_break;
                        }
                        $buf = '';
                    }
                    while (strlen($word) > 0) {
                        if ($length <= 0) {
                            break;
                        }
                        $len = $length;
                        if ($is_utf8) {
                            $len = $this->utf8CharBoundary($word, $len);
                        } elseif (substr($word, $len - 1, 1) == '=') {
                            $len--;
                        } elseif (substr($word, $len - 2, 1) == '=') {
                            $len -= 2;
                        }
                        $part = substr($word, 0, $len);
                        $word = substr($word, $len);
                        if (strlen($word) > 0) {
                            $message .= $part . sprintf('=%s', self::CRLF);
                        } else {
                            $buf = $part;
                        }
                    }
                } else {
                    $buf_o = $buf;
                    if (!$firstword) {
                        $buf .= ' ';
                    }
                    $buf .= $word;
                    if (strlen($buf) > $length and $buf_o != '') {
                        $message .= $buf_o . $soft_break;
                        $buf = $word;
                    }
                }
                $firstword = false;
            }
            $message .= $buf . self::CRLF;
        }
        return $message;
    }