特殊字符 0x85使 PHP 的 SimpleXMLElement 崩溃

Question

我正在尝试解析一个包含特殊八进制字符 205 的 XML 字符串。XML 字符串来自一个直播服务器。似乎这个字符使 SimpleXMLElement 的内部崩溃。// This is my metadata.php file:<?php    header('Content-type: application/json');    $output = file_get_contents('error.xml.bak');    $xml = new SimpleXMLElement($output, LIBXML_NOERROR|LIBXML_ERR_NONE) or die('Something is wrong');    echo 'OK';?>我收到以下错误：kazepis$ php metadata.phpPHP Fatal error:  Uncaught Exception: String could not be parsed as XML in /var/www/html/wolfclub/metadata.php:4Stack trace:#0 /var/www/html/radio/metadata.php(4): SimpleXMLElement->__construct('<?xml version="...', 32)#1 {main}thrown in /var/www/html/radio/metadata.php on line 4您可以在此处找到带有问题字符（十进制 133、八进制 205）的示例 XML： https ://wetransfer.com/downloads/f1b615c1cc09c8262cdd9965991b9cd420200123155505/801ab3 或内联：<?xml version="1.0" standalone="yes" ?><!DOCTYPE SHOUTCASTSERVER [<!ELEMENT SHOUTCASTSERVER (CURRENTLISTENERS,PEAKLISTENERS,MAXLISTENERS,REPORTEDLISTENERS,AVERAGETIME,SERVERGENRE,SERVERURL,SERVERTITLE,SONGTITLE,SONGURL,IRC,ICQ,AIM,WEBHITS,STREAMHITS,STREAMSTATUS,BITRATE,CONTENT,VERSION,WEBDATA,LISTENERS,SONGHISTORY)><!ELEMENT CURRENTLISTENERS (#PCDATA)><!ELEMENT PEAKLISTENERS (#PCDATA)><!ELEMENT MAXLISTENERS (#PCDATA)><!ELEMENT REPORTEDLISTENERS (#PCDATA)><!ELEMENT AVERAGETIME (#PCDATA)><!ELEMENT SERVERGENRE (#PCDATA)><!ELEMENT SERVERURL (#PCDATA)><!ELEMENT SERVERTITLE (#PCDATA)><!ELEMENT SONGTITLE (#PCDATA)><!ELEMENT SONGURL (#PCDATA)><!ELEMENT IRC (#PCDATA)><!ELEMENT ICQ (#PCDATA)><!ELEMENT AIM (#PCDATA)><!ELEMENT WEBHITS (#PCDATA)><!ELEMENT STREAMHITS (#PCDATA)><!ELEMENT STREAMSTATUS (#PCDATA)><!ELEMENT BITRATE (#PCDATA)><!ELEMENT CONTENT (#PCDATA)><!ELEMENT VERSION (#PCDATA)><!ELEMENT WEBDATA 任何想法为什么会发生这种情况？我的操作系统：PRETTY_NAME="Debian GNU/Linux 10 (buster)"NAME="Debian GNU/Linux"VERSION_ID="10"VERSION="10 (buster)"VERSION_CODENAME=busterID=debian谢谢！

Answer 1

我发现了这个： https ://www.php.net/manual/en/class.simplexmlelement.php#107869

但是，在我的情况下$errors，该行中显示的数组$errors = libxml_get_errors();始终为空。所以那个片段没有帮助。此外，我还收到以下警告：

PHP Warning:  DOMDocument::loadXML(): Input is not proper UTF-8, indicate encoding !\nBytes: 0x85 0x20 0x20 0x20 in Entity, line: 1 in /var/www/html/radio/metadata.php on line 6

[Fri Jan 24 18:56:12.290661 2020] [php7:warn] [pid 17910] [client 130.xxx.xxx.xxx:xxxxx] PHP Warning:  simplexml_import_dom(): Invalid Nodetype to import in /var/www/html/radio/metadata.php on line 12

utf8_encode()无论如何，我设法通过在将字符串提供给 SimpleXMLElement 构造函数之前对字符串进行编码来克服这种混乱的情况。

我生成的“测试” php 文件是：

<?php

//      header('Content-type: application/json');

        $output = file_get_contents('error.xml.bak');

        $output = utf8_encode($output);

        $doc = new DOMDocument('1.0', 'utf-8');

        $doc->loadXML($output);

        var_dump($output);

        $errors = libxml_get_errors();

        var_dump($errors);

        $xml = simplexml_import_dom($doc);

//      $xml = new SimpleXMLElement($output, LIBXML_NOERROR|LIBXML_ERR_NONE) or die('Something is wrong');

        var_dump($xml);

?>

这导致以下打印输出没有任何错误或警告......

string(3396) "]>13500011publichttp://www.virtualdj.com/wolfBARRY WHITE - YOU'RE THE FIRST,THE LAST  wolfwolfwolf806196audio/mpeg1.9.800600001100000000690378.129.222.56curl/7.29.00216021579791561 " array(0) { } object(SimpleXMLElement)#2 (22) { ["CURRENTLISTENERS"]=> string(1) "1" ["PEAKLISTENERS"]=> string(1) "3" ["MAXLISTENERS"]=> string(4) "5000" ["REPORTEDLISTENERS"]=> string(1) "1" ["AVERAGETIME"]=> string(1) "1" ["SERVERGENRE"]=> string(6) "public" ["SERVERURL"]=> string(25) "http://www.virtualdj.com/" ["SERVERTITLE"]=> string(4) "wolf" ["SONGTITLE"]=> string(64) "BARRY WHITE - YOU'RE THE FIRST,THE LAST  " ["SONGURL"]=> object(SimpleXMLElement)#3 (0) { } ["IRC"]=> string(4) "wolf" ["ICQ"]=> string(4) "wolf" ["AIM"]=> string(4) "wolf" ["WEBHITS"]=> string(2) "80" ["STREAMHITS"]=> string(1) "6" ["STREAMSTATUS"]=> string(1) "1" ["BITRATE"]=> string(2) "96" ["CONTENT"]=> string(10) "audio/mpeg" ["VERSION"]=> string(5) "1.9.8" ["WEBDATA"]=> object(SimpleXMLElement)#4 (20) { ["INDEX"]=> string(1) "0" ["LISTEN"]=> string(1) "0" ["PALM7"]=> string(1) "6" ["LOGIN"]=> string(1) "0" ["LOGINFAIL"]=> string(1) "0" ["PLAYED"]=> string(1) "0" ["COOKIE"]=> string(1) "0" ["ADMIN"]=> string(1) "1" ["UPDINFO"]=> string(1) "1" ["KICKSRC"]=> string(1) "0" ["KICKDST"]=> string(1) "0" ["UNBANDST"]=> string(1) "0" ["BANDST"]=> string(1) "0" ["VIEWBAN"]=> string(1) "0" ["UNRIPDST"]=> string(1) "0" ["RIPDST"]=> string(1) "0" ["VIEWRIP"]=> string(1) "0" ["VIEWXML"]=> string(2) "69" ["VIEWLOG"]=> string(1) "0" ["INVALID"]=> string(1) "3" } ["LISTENERS"]=> object(SimpleXMLElement)#5 (1) { ["LISTENER"]=> object(SimpleXMLElement)#7 (6) { ["HOSTNAME"]=> string(13) "78.129.222.56" ["USERAGENT"]=> string(11) "curl/7.29.0" ["UNDERRUNS"]=> string(1) "0" ["CONNECTTIME"]=> string(3) "216" ["POINTER"]=> string(1) "0" ["UID"]=> string(1) "2" } } ["SONGHISTORY"]=> object(SimpleXMLElement)#6 (1) { ["SONG"]=> object(SimpleXMLElement)#7 (2) { ["PLAYEDAT"]=> string(10) "1579791561" ["TITLE"]=> string(64) "BARRY WHITE - YOU'RE THE FIRST,THE LAST  " } } } 

注意：有问题的角色仍然存在！ \u0085但正确编码所以我想这就是为什么它不再是一个问题......

我还使用 SimpleXMLElement 构造函数尝试了以前版本的代码：

<?php

        $output = file_get_contents('error.xml.bak');

        $output = utf8_encode($output);

        $xml = new SimpleXMLElement($output, LIBXML_NOERROR|LIBXML_ERR_NONE) or die('Something is wrong');

        echo json_encode($xml);

?>

这也按预期工作：

{"CURRENTLISTENERS":"1","PEAKLISTENERS":"3","MAXLISTENERS":"5000","REPORTEDLISTENERS":"1","AVERAGETIME":"1","SERVERGENRE":"public","SERVERURL":"http:\/\/www.virtualdj.com\/","SERVERTITLE":"wolf","SONGTITLE":"BARRY WHITE - YOU'RE THE FIRST,THE LAST \u0085 ","SONGURL":{},"IRC":"wolf","ICQ":"wolf","AIM":"wolf","WEBHITS":"80","STREAMHITS":"6","STREAMSTATUS":"1","BITRATE":"96","CONTENT":"audio\/mpeg","VERSION":"1.9.8","WEBDATA":{"INDEX":"0","LISTEN":"0","PALM7":"6","LOGIN":"0","LOGINFAIL":"0","PLAYED":"0","COOKIE":"0","ADMIN":"1","UPDINFO":"1","KICKSRC":"0","KICKDST":"0","UNBANDST":"0","BANDST":"0","VIEWBAN":"0","UNRIPDST":"0","RIPDST":"0","VIEWRIP":"0","VIEWXML":"69","VIEWLOG":"0","INVALID":"3"},"LISTENERS":{"LISTENER":{"HOSTNAME":"78.129.222.56","USERAGENT":"curl\/7.29.0","UNDERRUNS":"0","CONNECTTIME":"216","POINTER":"0","UID":"2"}},"SONGHISTORY":{"SONG":{"PLAYEDAT":"1579791561","TITLE":"BARRY WHITE - YOU'RE THE FIRST,THE LAST \u0085 "}}}

注意最后的 \u0085 ...