我在http://deer.org.ua/2009/10/06/1/:上找到了一个解决方案

class Encoding
{
    /**
     * http://deer.org.ua/2009/10/06/1/
     * @param $string
     * @return null
     */
    public static function detect_encoding($string)
    {
        static $list = ['utf-8', 'windows-1251'];

        foreach ($list as $item) {
            try {
                $sample = iconv($item, $item, $string);
            } catch (\Exception $e) {
                continue;
            }
            if (md5($sample) == md5($string)) {
                return $item;
            }
        }
        return null;
    }
}

$content = file_get_contents($file['tmp_name']);
$encoding = Encoding::detect_encoding($content);
if ($encoding != 'utf-8') {
    $result = iconv($encoding, 'utf-8', $content);
} else {
    $result = $content;
}

我认为@是一个糟糕的决定，并对deer.org.ua的解决方案做了一些更改。

if(!mb_check_encoding($str)){
    $str = iconv("windows-1251", "UTF-8", $str);
}

这对我很有帮助

如果您将utf8_encode()应用于一个已经UTF-8的字符串，它将返回乱码的UTF-8输出。

我做了一个函数来解决所有这些问题。它被称为Encoding::toUTF8()。

你不需要知道字符串的编码是什么。它可以是Latin1 (ISO 8859-1)、Windows-1252或UTF-8，或者字符串可以是它们的混合。Encoding::toUTF8()将所有内容转换为UTF-8。

我这样做是因为一个服务给了我一个混乱的数据提要，在同一个字符串中混合了UTF-8和Latin1。

用法:

require_once('Encoding.php');
use \ForceUTF8\Encoding;  // It's namespaced now.

$utf8_string = Encoding::toUTF8($utf8_or_latin1_or_mixed_string);

$latin1_string = Encoding::toLatin1($utf8_or_latin1_or_mixed_string);

下载:

https://github.com/neitanod/forceutf8

我还包含了另一个函数Encoding::fixUFT8()，它将修复每个看起来乱码的UTF-8字符串。

用法:

require_once('Encoding.php');
use \ForceUTF8\Encoding;  // It's namespaced now.

$utf8_string = Encoding::fixUTF8($garbled_utf8_string);

例子:

echo Encoding::fixUTF8("Fédération Camerounaise de Football");
echo Encoding::fixUTF8("Fédération Camerounaise de Football");
echo Encoding::fixUTF8("FÃÂédÃÂération Camerounaise de Football");
echo Encoding::fixUTF8("Fédération Camerounaise de Football");

将输出:

Fédération Camerounaise de Football
Fédération Camerounaise de Football
Fédération Camerounaise de Football
Fédération Camerounaise de Football

我在一个名为Encoding的类上将函数(forceeutf8)转换为一系列静态函数。新函数是Encoding::toUTF8()。

不带auto的Try

那就是:

mb_detect_encoding($text)

而不是:

mb_detect_encoding($text, 'auto')

更多信息可以在这里找到:mb_detect_encoding

首先必须检测使用了什么编码。在解析RSS提要时(可能通过HTTP)，应该从Content-Type HTTP报头字段的字符集参数中读取编码。如果不存在，则从XML处理指令的encoding属性中读取编码。如果也没有，请使用规范中定义的UTF-8。

以下是我可能会做的:

I’d use cURL to send and fetch the response. That allows you to set specific header fields and fetch the response header as well. After fetching the response, you have to parse the HTTP response and split it into header and body. The header should then contain the Content-Type header field that contains the MIME type and (hopefully) the charset parameter with the encoding/charset too. If not, we’ll analyse the XML PI for the presence of the encoding attribute and get the encoding from there. If that’s also missing, the XML specs define to use UTF-8 as encoding.

$url = 'http://www.lr-online.de/storage/rss/rss/sport.xml';

$accept = array(
    'type' => array('application/rss+xml', 'application/xml', 'application/rdf+xml', 'text/xml'),
    'charset' => array_diff(mb_list_encodings(), array('pass', 'auto', 'wchar', 'byte2be', 'byte2le', 'byte4be', 'byte4le', 'BASE64', 'UUENCODE', 'HTML-ENTITIES', 'Quoted-Printable', '7bit', '8bit'))
);
$header = array(
    'Accept: '.implode(', ', $accept['type']),
    'Accept-Charset: '.implode(', ', $accept['charset']),
);
$encoding = null;
$curl = curl_init($url);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_HEADER, true);
curl_setopt($curl, CURLOPT_HTTPHEADER, $header);
$response = curl_exec($curl);
if (!$response) {
    // error fetching the response
} else {
    $offset = strpos($response, "\r\n\r\n");
    $header = substr($response, 0, $offset);
    if (!$header || !preg_match('/^Content-Type:\s+([^;]+)(?:;\s*charset=(.*))?/im', $header, $match)) {
        // error parsing the response
    } else {
        if (!in_array(strtolower($match[1]), array_map('strtolower', $accept['type']))) {
            // type not accepted
        }
        $encoding = trim($match[2], '"\'');
    }
    if (!$encoding) {
        $body = substr($response, $offset + 4);
        if (preg_match('/^<\?xml\s+version=(?:"[^"]*"|\'[^\']*\')\s+encoding=("[^"]*"|\'[^\']*\')/s', $body, $match)) {
            $encoding = trim($match[1], '"\'');
        }
    }
    if (!$encoding) {
        $encoding = 'utf-8';
    } else {
        if (!in_array($encoding, array_map('strtolower', $accept['charset']))) {
            // encoding not accepted
        }
        if ($encoding != 'utf-8') {
            $body = mb_convert_encoding($body, 'utf-8', $encoding);
        }
    }
    $simpleXML = simplexml_load_string($body, null, LIBXML_NOERROR);
    if (!$simpleXML) {
        // parse error
    } else {
        echo $simpleXML->asXML();
    }
}

我在phpQuery (ISO-8859-1而不是UTF-8)上也有同样的问题，这个hack帮助了我:

$html = '<?xml version="1.0" encoding="UTF-8" ?>' . $html;

mb_internal_encoding('UTF-8')， phpQuery::newDocumentHTML($html， 'UTF-8')， mbstring.internal_encoding和其他操作没有起任何作用。