PHP解析html类库simple_html_dom的转码bug

// 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,3) == "xefxbbxbf")
{
$converted_text = substr($converted_text,3);
}
if (substr($converted_text,-3) == "xefxbbxbf")
{
$converted_text = substr($converted_text,-3);
}
}
return $converted_text;
}

$converted_text = iconv($sourceCharset,$text);

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$converted_text = iconv($sourceCharset,$text);

$converted_text = $text;