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copied!<p>A more contemporary method would be to use <a href="http://php.net/http_negotiate_language" rel="nofollow noreferrer"><code>http_negotiate_language()</code></a>:</p> <pre><code> $map = array("en" => "english", "es" => "spanish"); $conf_language= $map[ http_negotiate_language(array_keys($map)) ]; </code></pre> <p>If you don't have the <a href="http://www.php.net/book.http" rel="nofollow noreferrer">http extension</a> installed (<a href="https://stackoverflow.com/a/6157895/367456">and not the intl one as well</a>), there is yet another workaround in the comments (<a href="http://php.net/function.http-negotiate-language#86787" rel="nofollow noreferrer">user-note #86787 (Nov 2008; by Anonymous)</a>):</p> <pre><code><?php /* determine which language out of an available set the user prefers most $available_languages array with language-tag-strings (must be lowercase) that are available $http_accept_language a HTTP_ACCEPT_LANGUAGE string (read from $_SERVER['HTTP_ACCEPT_LANGUAGE'] if left out) */ function prefered_language ($available_languages,$http_accept_language="auto") { // if $http_accept_language was left out, read it from the HTTP-Header if ($http_accept_language == "auto") $http_accept_language = isset($_SERVER['HTTP_ACCEPT_LANGUAGE']) ? $_SERVER['HTTP_ACCEPT_LANGUAGE'] : ''; // standard for HTTP_ACCEPT_LANGUAGE is defined under // http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.4 // pattern to find is therefore something like this: // 1#( language-range [ ";" "q" "=" qvalue ] ) // where: // language-range = ( ( 1*8ALPHA *( "-" 1*8ALPHA ) ) | "*" ) // qvalue = ( "0" [ "." 0*3DIGIT ] ) // | ( "1" [ "." 0*3("0") ] ) preg_match_all("/([[:alpha:]]{1,8})(-([[:alpha:]|-]{1,8}))?" . "(\s*;\s*q\s*=\s*(1\.0{0,3}|0\.\d{0,3}))?\s*(,|$)/i", $http_accept_language, $hits, PREG_SET_ORDER); // default language (in case of no hits) is the first in the array $bestlang = $available_languages[0]; $bestqval = 0; foreach ($hits as $arr) { // read data from the array of this hit $langprefix = strtolower ($arr[1]); if (!empty($arr[3])) { $langrange = strtolower ($arr[3]); $language = $langprefix . "-" . $langrange; } else $language = $langprefix; $qvalue = 1.0; if (!empty($arr[5])) $qvalue = floatval($arr[5]); // find q-maximal language if (in_array($language,$available_languages) && ($qvalue > $bestqval)) { $bestlang = $language; $bestqval = $qvalue; } // if no direct hit, try the prefix only but decrease q-value by 10% (as http_negotiate_language does) else if (in_array($langprefix,$available_languages) && (($qvalue*0.9) > $bestqval)) { $bestlang = $langprefix; $bestqval = $qvalue*0.9; } } return $bestlang; } ?> </code></pre>

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