Googlebot收到错误

Question

我有以下代码作为我的多语言网站的index.php。每种可用的语言都有一个子目录。

<?php


if (isset($_POST['URL']) && strlen($_POST['URL']) == 3) {
         header("location: ".$_POST[URL]);
}
else {

    function lixlpixel_get_env_var($Var)
    {
         if(empty($GLOBALS[$Var]))
         {
             $GLOBALS[$Var]=(!empty($GLOBALS['_SERVER'][$Var]))?
             $GLOBALS['_SERVER'][$Var] : (!empty($GLOBALS['HTTP_SERVER_VARS'][$Var])) ? $GLOBALS['HTTP_SERVER_VARS'][$Var]:'';
         }
    }

    function lixlpixel_detect_lang()
    {
         // Detect HTTP_ACCEPT_LANGUAGE & HTTP_USER_AGENT.
         lixlpixel_get_env_var('HTTP_ACCEPT_LANGUAGE');
         lixlpixel_get_env_var('HTTP_USER_AGENT');

         $_AL=strtolower($GLOBALS['HTTP_ACCEPT_LANGUAGE']);
         $_UA=strtolower($GLOBALS['HTTP_USER_AGENT']);

         // Try to detect Primary language if several languages are accepted.
         foreach($GLOBALS['_LANG'] as $K)
         {
             if(strpos($_AL, $K)===0)
             return $K;
         }

         // Try to detect any language if not yet detected.
         foreach($GLOBALS['_LANG'] as $K)
         {
             if(strpos($_AL, $K)!==false)
             return $K;
         }
         foreach($GLOBALS['_LANG'] as $K)
         {
             if(preg_match("/[[( ]{$K}[;,_-)]/",$_UA))
             return $K;
         }

         // Return default language if language is not yet detected.
         return $GLOBALS['_DLANG'];
    }

    // Define default language.
    $GLOBALS['_DLANG']='en';

    // Define all available languages.
    // WARNING: uncomment all available languages

    $GLOBALS['_LANG'] = array(
    'en', // english.
    'es', // spanish.
    'fr', // french.
    );

    /*
    $GLOBALS['_LANG'] = array(
    'af', // afrikaans.
    'ar', // arabic.
    'bg', // bulgarian.
    'ca', // catalan.
    'cs', // czech.
    'da', // danish.
    'de', // german.
    'el', // greek.
    'en', // english.
    'es', // spanish.
    'et', // estonian.
    'fi', // finnish.
    'fr', // french.
    'gl', // galician.
    'he', // hebrew.
    'hi', // hindi.
    'hr', // croatian.
    'hu', // hungarian.
    'id', // indonesian.
    'it', // italian.
    'ja', // japanese.
    'ko', // korean.
    'ka', // georgian.
    'lt', // lithuanian.
    'lv', // latvian.
    'ms', // malay.
    'nl', // dutch.
    'no', // norwegian.
    'pl', // polish.
    'pt', // portuguese.
    'ro', // romanian.
    'ru', // russian.
    'sk', // slovak.
    'sl', // slovenian.
    'sq', // albanian.
    'sr', // serbian.
    'sv', // swedish.
    'th', // thai.
    'tr', // turkish.
    'uk', // ukrainian.
    'zh' // chinese.
    );
    */

    // Redirect to the correct location.


    header('location: /'.lixlpixel_detect_lang());
    //header('location: http://www.your_site.com/index_'.lixlpixel_detect_lang().'.php'); // Example Implementation
    echo 'The Language detected is: '.lixlpixel_detect_lang(); // For Demonstration

}

?>

问题是，尽管这在用户浏览器中工作得很好，但在搜索引擎(如Googlebot)中会抛出以下错误：

    <br />
<b>Warning</b>:  preg_match() [<a href='function.preg-match'>function.preg-match</a>]: Compilation failed: range out of order in character class at offset 12 in <b>/index.php</b> on line <b>41</b><br />
<br />
<b>Warning</b>:  preg_match() [<a href='function.preg-match'>function.preg-match</a>]: Compilation failed: range out of order in character class at offset 12 in <b>/index.php</b> on line <b>41</b><br />
<br />
<b>Warning</b>:  preg_match() [<a href='function.preg-match'>function.preg-match</a>]: Compilation failed: range out of order in character class at offset 12 in <b>/index.php</b> on line <b>41</b><br />
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /index.php:41) in <b>/index.php</b> on line <b>110</b><br />
<br />
<b>Warning</b>:  preg_match() [<a href='function.preg-match'>function.preg-match</a>]: Compilation failed: range out of order in character class at offset 12 in <b>/index.php</b> on line <b>41</b><br />
<br />
<b>Warning</b>:  preg_match() [<a href='function.preg-match'>function.preg-match</a>]: Compilation failed: range out of order in character class at offset 12 in <b>/index.php</b> on line <b>41</b><br />
<br />
<b>Warning</b>:  preg_match() [<a href='function.preg-match'>function.preg-match</a>]: Compilation failed: range out of order in character class at offset 12 in <b>/index.php</b> on line <b>41</b><br />
The Language detected is: en

我尝试过错误处理，但我不是一个PHP程序员，我是一个CF程序员，所以我真的需要一些帮助！

Answer 1

在character class中，-表示一个范围。在本例中，[;,_-)]中的_-)被解释为范围( _和)之间的每个字符都包括在内)。但_ (0x95)在) (0x28)之后，因此_-)是无效范围。

如果您指的是三个单独的字符_、-和)，则对-进行转义

[;,_\-)]

除此之外，是一个加权值列表(参见q参数)。这意味着只出现一个特定的语言标签并不一定意味着它是最受欢迎的语言。可能有一些语言更受欢迎(Q值更高)，甚至根本不被接受(例如q=0)。

因此，您应该更好地解析列表并找到首选语言和可用语言的最佳匹配，而不是仅仅寻找特定语言标记的出现。