在PHP中检测浏览器语言并相应地设置$ locale

Question

我正在努力实现,当有人访问我的wordpress页面时,加载了他的语言的.po(语言)包.目前,可以通过向URL添加？lang =参数来更改语言.但我希望根据浏览器语言选择正确的语言.

我的代码:

<?php
// start the session 
session_start();
$browserlang = " ".$_SERVER['HTTP_ACCEPT_LANGUAGE'];

// if there's a "lang" parameter in the URL...  
if( isset( $_GET[ 'lang' ] ) ) { 

    // ...set a session variable named WPLANG based on the URL parameter...     
    $_SESSION[ 'WPLANG' ] = $_GET[ 'lang' ]; 

    // ...and define the WPLANG constant with the WPLANG session variable 
    $locale = $_SESSION[ 'WPLANG' ];
    echo 'Based on URL parameter';

// if there isn't a "lang" parameter in the URL...  
} else {

    // if the WPLANG session variable is already set...
    if( isset( $_SESSION[ 'WPLANG' ] ) ) {

        // ...define the WPLANG constant with the WPLANG session variable 
        $locale = $_SESSION[ 'WPLANG' ];
        echo 'Based on session variable';

   // if the WPLANG session variable isn't set...
   } else { 

        // set the WPLANG constant to your default language code is (or empty, if you don't need it)        
        $locale = $browserlang;
        echo 'Should be based on browser language. It is:' . $browserlang;

    } 
};
?>

$ locale用于设置语言并选择正确的.po文件.

现在我想要$ locale

$ locale ='en_US'

默认情况下,当有人进入具有默认语言"de","de_DE","de_CH"或"de_AT"的页面时,它应该是.

$ locale ='de_DE'

我目前正在使用的代码不起作用.

$browserlang = " ".$_SERVER['HTTP_ACCEPT_LANGUAGE'];
echo $browserlang;

向我展示正确的语言,即"de_DE",但$locale = $browserlang不做任何事情.另一方面,当我设置$locale = 'de_DE'它工作...

提前谢谢你们.

编辑:

当我使用的echo $locale是de-DE.多数民众赞成,因为它不起作用......

编辑2:

那是因为它必须是de_DE(下划线)而不是de-DE(减号)......如何解决这个问题？

编辑3:

最后它有效.

Answer 1

编辑3：

让它工作：

<?php
// start the session 
session_start();

// if there's a "lang" parameter in the URL...  
if( isset( $_GET[ 'lang' ] ) ) { 

    // ...set a session variable named WPLANG based on the URL parameter...     
    $_SESSION[ 'WPLANG' ] = $_GET[ 'lang' ]; 

    // ...and define the WPLANG constant with the WPLANG session variable 
    $locale = $_SESSION[ 'WPLANG' ];
    $languagemsg = 'based on url parameter';

// if there isn't a "lang" parameter in the URL...  
} else {

    // if the WPLANG session variable is already set...
    if( isset( $_SESSION[ 'WPLANG' ] ) ) {

        // ...define the WPLANG constant with the WPLANG session variable 
        $locale = $_SESSION[ 'WPLANG' ];
        $languagemsg = 'based on session variable';

    // if the WPLANG session variable isn't set...
    } else { 

        // set the WPLANG constant to your default language code is (or empty, if you don't need it) 
        $browserlang = substr($_SERVER["HTTP_ACCEPT_LANGUAGE"],0,2);
        if ($browserlang == 'de') {$browserlang = 'de_DE';}
        else {$browserlang = 'en_US';}
        $_SESSION[ 'WPLANG' ] = $browserlang;
        $locale = $browserlang;
        $languagemsg = 'based on browser language';

    } 
};
?>

现代浏览器总是将首选语言列在其他语言的前面。这就是为什么我只选择刺痛的前两个字母：

$browserlang = substr($_SERVER["HTTP_ACCEPT_LANGUAGE"],0,2);

现在我设置$browserlang = de_DE所有以“de”开头的语言代码。对于我设置的所有其他语言$browserlang = en_US。

'$languagemsg' 只是出于调试原因。