PHPMailer::wrapText( string $message, int $length, bool $qp_mode = false ): string

2622    public function wrapText($message, $length, $qp_mode = false)2623    {2624        if ($qp_mode) {2625            $soft_break = sprintf(' =%s', static::$LE);2626        } else {2627            $soft_break = static::$LE;2628        }2629        //If utf-8 encoding is used, we will need to make sure we don't2630        //split multibyte characters when we wrap2631        $is_utf8 = static::CHARSET_UTF8 === strtolower($this->CharSet);2632        $lelen = strlen(static::$LE);2633        $crlflen = strlen(static::$LE);2634 2635        $message = static::normalizeBreaks($message);2636        //Remove a trailing line break2637        if (substr($message, -$lelen) === static::$LE) {2638            $message = substr($message, 0, -$lelen);2639        }2640 2641        //Split message into lines2642        $lines = explode(static::$LE, $message);2643        //Message will be rebuilt in here2644        $message = '';2645        foreach ($lines as $line) {2646            $words = explode(' ', $line);2647            $buf = '';2648            $firstword = true;2649            foreach ($words as $word) {2650                if ($qp_mode && (strlen($word) > $length)) {2651                    $space_left = $length - strlen($buf) - $crlflen;2652                    if (!$firstword) {2653                        if ($space_left > 20) {2654                            $len = $space_left;2655                            if ($is_utf8) {2656                                $len = $this->utf8CharBoundary($word, $len);2657                            } elseif ('=' === substr($word, $len - 1, 1)) {2658                                --$len;2659                            } elseif ('=' === substr($word, $len - 2, 1)) {2660                                $len -= 2;2661                            }2662                            $part = substr($word, 0, $len);2663                            $word = substr($word, $len);2664                            $buf .= ' ' . $part;2665                            $message .= $buf . sprintf('=%s', static::$LE);2666                        } else {2667                            $message .= $buf . $soft_break;2668                        }2669                        $buf = '';2670                    }2671                    while ($word !== '') {2672                        if ($length <= 0) {2673                            break;2674                        }2675                        $len = $length;2676                        if ($is_utf8) {2677                            $len = $this->utf8CharBoundary($word, $len);2678                        } elseif ('=' === substr($word, $len - 1, 1)) {2679                            --$len;2680                        } elseif ('=' === substr($word, $len - 2, 1)) {2681                            $len -= 2;2682                        }2683                        $part = substr($word, 0, $len);2684                        $word = (string) substr($word, $len);2685 2686                        if ($word !== '') {2687                            $message .= $part . sprintf('=%s', static::$LE);2688                        } else {2689                            $buf = $part;2690                        }2691                    }2692                } else {2693                    $buf_o = $buf;2694                    if (!$firstword) {2695                        $buf .= ' ';2696                    }2697                    $buf .= $word;2698 2699                    if ('' !== $buf_o && strlen($buf) > $length) {2700                        $message .= $buf_o . $soft_break;2701                        $buf = $word;