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PHP解析html类库simple_html_dom的转码bug_PHP

Jun 01, 2016 am 11:54 AM
php

这几天有在用simple_html_dom抓一些文章。不同网站的编码在国内基本上是gbk gb2312 utf-8。而以gb2312和utf-8居多。

我这一版的simple_html_dom有一个方法 convert_text 是这个样子的。

复制代码 代码如下:
 // PaperG - Function to convert the text from one character set to another if the two sets are not the same.
 function convert_text($text)
 {
  global $debug_object;
  if (is_object($debug_object)) {$debug_object->debug_log_entry(1);}
  $converted_text = $text;
  $sourceCharset = "";
  $targetCharset = "";
  if ($this->dom)
  {
   $sourceCharset = strtoupper($this->dom->_charset);
   $targetCharset = strtoupper($this->dom->_target_charset);
  }
  if (is_object($debug_object)) {$debug_object->debug_log(3, "source charset: " . $sourceCharset . " target charaset: " . $targetCharset);}
  if (!empty($sourceCharset) && !empty($targetCharset) && (strcasecmp($sourceCharset, $targetCharset) != 0))
  {
   // Check if the reported encoding could have been incorrect and the text is actually already UTF-8
   if ((strcasecmp($targetCharset, 'UTF-8') == 0) && ($this->is_utf8($text)))
   {
    $converted_text = $text;
   }
   else
   {
    $converted_text = iconv($sourceCharset, $targetCharset, $text);
   }
  }
  // Lets make sure that we don't have that silly BOM issue with any of the utf-8 text we output.
  if ($targetCharset == 'UTF-8')
  {
   if (substr($converted_text, 0, 3) == "\xef\xbb\xbf")
   {
    $converted_text = substr($converted_text, 3);
   }
   if (substr($converted_text, -3) == "\xef\xbb\xbf")
   {
    $converted_text = substr($converted_text, 0, -3);
   }
  }
  return $converted_text;
 }

来看这一行:

复制代码 代码如下:
    $converted_text = iconv($sourceCharset, $targetCharset, $text); 

会引起转码不正确。比如会把gb2312的文字转成:

复制代码 代码如下:
4月26日在鏈濋槼公园马术场举行的2014浪琴国际马联场地障碍世界杯中国联赛资格赛上,24岁的韩壮壮不仅拿到零罚分的成绩 ...第7个出场的鍖椾含奥运骑手赵志文第一个收获零罚分,用时77秒07 ...

既成的事实了,证明里头的转码功能没有处理好。由于我使用这个simple_html_dom只是想要用来构建dom。我并没有打算花时间去很好地处理这个bug。而是简单地把

复制代码 代码如下:
$converted_text = iconv($sourceCharset, $targetCharset, $text);

改成

复制代码 代码如下:
$converted_text = $text;

就行了。思路就是取消它的转码。好吧工作不必纠结,可以继续了。

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