I was looking for a way to detect a users os language, and i found this at http://techpatterns.com/forums/about120.html , i modified the look just a bit and i tested it on firefox and it said my lang was en (english) so i tried it in opera with the language as zh (chinese) and it still says i'm using english, but when i go to with chinese lang still on, google displays chinese search results.. anyone know whats wrong?
php 5 (latest), abyss x1 (latest), firefox 1.5.0.6, opera 8.5


<?php
/*
// Author(s):: lixlpixel?? http://techpatterns.com/forums/about120.html
// Description: Language detect script.
// Example(s): 

header('location: http://22nd.org/'.lixlpixel_detect_lang().'/index.php'); // redirect example

echo '<html><head></head><body>Welcome to 22nd.org.<br>We have detected your preferred language is: <b>'.lixlpixel_detect_lang().'</b> If this is correct, please proceed:</body></html>'; // For Demonstration
*/

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

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

$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.
);

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 $K) { //strstr()
		if(strpos($_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'];
}
?> 

<?php 
//header('location: http://127.0.0.1/'.lixlpixel_detect_lang().'/index.php'); 

echo '
<html>
<head></head>
<body>
<br>We have detected your preferred language is: <b>'.lixlpixel_detect_lang().'</b>
If this is correct, please proceed:
</body>
</html>
'; 
?>