使用PHP从RTF数据中提取文本

我已经看了所有的地方并尝试了一些不同的方法，但我似乎无法正确地从一些RTF数据中获取文本（使用linbreaks）。目前我正在使用

我正在写一些东西，将从一个存储RTF数据的文件中提取歌词。下面是一个示例输入行：

{\rtf1\ansi\ansicpg1252\cocoartf1038\cocoasubrtf350
{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
{\colortbl;\red255\green255\blue255;}
\pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\qc\pardirnatural

\f0\fs96 \cf1 Be near O God\
Be near O God of us\
Your nearness is to us our good\
Be near O God\
Be near O God of us\
Your nearness is to us our good\
Our good}

然后通过上面的链接函数运行它会产生以下结果：

  Be near O GodBe near O God of usYour nearness is to us our goodBe near O GodBe near O God of usYour nearness is to us our goodOur good

它获取文本，但也会以一种无用的方式删除所有换行符。它没有出现在这里，但出于某种原因，它也有几个领先的突破

---

关于如何在保留换行符的同时用PHP正确解析此RTF数据，有什么想法吗？

我不太清楚。您只是复制了整个函数，并在底部添加了一行。我知道如何调用这个函数，我的问题是这个函数没有做我想做的事情。也许我没有领会你的意思？@ChrisBarr从我记忆中我修改了这个函数，原因是一些小问题，在PHP5.1上工作得非常出色！
<?php

 function rtf_isPlainText($s) {
    $arrfailAt = array("*", "fonttbl", "colortbl", "datastore", "themedata");
    for ($i = 0; $i < count($arrfailAt); $i++)
        if (!empty($s[$arrfailAt[$i]])) return false;
    return true;
} 

function rtf2txt($filename) {
    // Read the data from the input file.
    $text = file_get_contents($filename);
    if (!strlen($text))
        return "";

    // Create empty stack array.
    $document = "";
    $stack = array();
    $j = -1;
    // Read the data character-by- character…
    for ($i = 0, $len = strlen($text); $i < $len; $i++) {
        $c = $text[$i];

        // Depending on current character select the further actions.
        switch ($c) {
            // the most important key word backslash
            case "\\":
                // read next character
                $nc = $text[$i + 1];

                // If it is another backslash or nonbreaking space or hyphen,
                // then the character is plain text and add it to the output stream.
                if ($nc == '\\' && rtf_isPlainText($stack[$j])) $document .= '\\';
                elseif ($nc == '~' && rtf_isPlainText($stack[$j])) $document .= ' ';
                elseif ($nc == '_' && rtf_isPlainText($stack[$j])) $document .= '-';
                // If it is an asterisk mark, add it to the stack.
                elseif ($nc == '*') $stack[$j]["*"] = true;
                // If it is a single quote, read next two characters that are the hexadecimal notation
                // of a character we should add to the output stream.
                elseif ($nc == "'") {
                    $hex = substr($text, $i + 2, 2);
                    if (rtf_isPlainText($stack[$j]))
                        $document .= html_entity_decode("&#".hexdec($hex).";");
                    //Shift the pointer.
                    $i += 2;
                // Since, we’ve found the alphabetic character, the next characters are control word
                // and, possibly, some digit parameter.
                } elseif ($nc >= 'a' && $nc <= 'z' || $nc >= 'A' && $nc <= 'Z') {
                    $word = "";
                    $param = null;

                    // Start reading characters after the backslash.
                    for ($k = $i + 1, $m = 0; $k < strlen($text); $k++, $m++) {
                        $nc = $text[$k];
                        // If the current character is a letter and there were no digits before it,
                        // then we’re still reading the control word. If there were digits, we should stop
                        // since we reach the end of the control word.
                        if ($nc >= 'a' && $nc <= 'z' || $nc >= 'A' && $nc <= 'Z') {
                            if (empty($param))
                                $word .= $nc;
                            else
                                break;
                        // If it is a digit, store the parameter.
                        } elseif ($nc >= '0' && $nc <= '9')
                            $param .= $nc;
                        // Since minus sign may occur only before a digit parameter, check whether
                        // $param is empty. Otherwise, we reach the end of the control word.
                        elseif ($nc == '-') {
                            if (empty($param))
                                $param .= $nc;
                            else
                                break;
                        } else
                            break;
                    }
                    // Shift the pointer on the number of read characters.
                    $i += $m - 1;

                    // Start analyzing what we’ve read. We are interested mostly in control words.
                    $toText = "";
                    switch (strtolower($word)) {
                        // If the control word is "u", then its parameter is the decimal notation of the
                        // Unicode character that should be added to the output stream.
                        // We need to check whether the stack contains \ucN control word. If it does,
                        // we should remove the N characters from the output stream.
                        case "u":
                            $toText .= html_entity_decode("&#x".dechex($param).";");
                            $ucDelta = @$stack[$j]["uc"];
                            if ($ucDelta > 0)
                                $i += $ucDelta;
                        break;
                        // Select line feeds, spaces and tabs.
                        case "par": case "page": case "column": case "line": case "lbr":
                            $toText .= "\n"; 
                        break;
                        case "emspace": case "enspace": case "qmspace":
                            $toText .= " "; 
                        break;
                        case "tab": $toText .= "\t"; break;
                        // Add current date and time instead of corresponding labels.
                        case "chdate": $toText .= date("m.d.Y"); break;
                        case "chdpl": $toText .= date("l, j F Y"); break;
                        case "chdpa": $toText .= date("D, j M Y"); break;
                        case "chtime": $toText .= date("H:i:s"); break;
                        // Replace some reserved characters to their html analogs.
                        case "emdash": $toText .= html_entity_decode("&mdash;"); break;
                        case "endash": $toText .= html_entity_decode("&ndash;"); break;
                        case "bullet": $toText .= html_entity_decode("&#149;"); break;
                        case "lquote": $toText .= html_entity_decode("&lsquo;"); break;
                        case "rquote": $toText .= html_entity_decode("&rsquo;"); break;
                        case "ldblquote": $toText .= html_entity_decode("&laquo;"); break;
                        case "rdblquote": $toText .= html_entity_decode("&raquo;"); break;
                        // Add all other to the control words stack. If a control word
                        // does not include parameters, set &param to true.
                        default:
                            $stack[$j][strtolower($word)] = empty($param) ? true : $param;
                        break;
                    }
                    // Add data to the output stream if required.
                    if (rtf_isPlainText($stack[$j]))
                        $document .= $toText;
                }

                $i++;
            break;
            // If we read the opening brace {, then new subgroup starts and we add
            // new array stack element and write the data from previous stack element to it.
            case "{":
                array_push($stack, $stack[$j++]);
            break;
            // If we read the closing brace }, then we reach the end of subgroup and should remove 
            // the last stack element.
            case "}":
                array_pop($stack);
                $j--;
            break;
            // Skip “trash”.
            case '\0': case '\r': case '\f': case '\n': break;
            // Add other data to the output stream if required.
            default:
                if (rtf_isPlainText($stack[$j]))
                    $document .= $c;
            break;
        }
    }
    // Return result.
    return $document;
}

echo rtf2txt('here is your file path');
?>