Discuz 教程：discuz 加载语言包

比如我想加载 lang_spacecp.php 这个语言包
只需要在前面使用函数 lang('spacecp'); 然后就可以使用 $_G['lang']['spacecp']来进行调用这个语言包。
还可以直接使用 lang('spacecp','xxx')来直接显示语言。

/**
* 加载语言
* 语言文件统一为 $lang = array();
* @param $file - 语言文件，可包含路径如 forum/xxx home/xxx
* @param $langvar - 语言文字索引
* @param $vars - 变量替换数组
* @return 语言文字
*/
function lang($file, $langvar = null, $vars = array(), $default = null) {
    global $_G;
    $fileinput = $file;
    list($path, $file) = explode('/', $file);
    if(!$file) {
        $file = $path;
        $path = '';
    }
    if(strpos($file, ':') !== false) {
        $path = 'plugin';
        list($file) = explode(':', $file);
    }

    if($path != 'plugin') {
        $key = $path == '' ? $file : $path.'_'.$file;
        if(!isset($_G['lang'][$key])) {
            include DISCUZ_ROOT.'./source/language/'.($path == '' ? '' : $path.'/').'lang_'.$file.'.php';
            $_G['lang'][$key] = $lang;
        }
        if(defined('IN_MOBILE') && !defined('TPL_DEFAULT')) {
            include DISCUZ_ROOT.'./source/language/mobile/lang_template.php';
            $_G['lang'][$key] = array_merge($_G['lang'][$key], $lang);
        }
        if($file != 'error' && !isset($_G['cache']['pluginlanguage_system'])) {
            loadcache('pluginlanguage_system');
        }
        if(!isset($_G['hooklang'][$fileinput])) {
            if(isset($_G['cache']['pluginlanguage_system'][$fileinput]) && is_array($_G['cache']['pluginlanguage_system'][$fileinput])) {
                $_G['lang'][$key] = array_merge($_G['lang'][$key], $_G['cache']['pluginlanguage_system'][$fileinput]);
            }
            $_G['hooklang'][$fileinput] = true;
        }
        $returnvalue = &$_G['lang'];
    } else {
        if(empty($_G['config']['plugindeveloper'])) {
            loadcache('pluginlanguage_script');
        } elseif(!isset($_G['cache']['pluginlanguage_script'][$file]) && preg_match("/^[a-z]+[a-z0-9_]*$/i", $file)) {
            if(@include(DISCUZ_ROOT.'./data/plugindata/'.$file.'.lang.php')) {
                $_G['cache']['pluginlanguage_script'][$file] = $scriptlang[$file];
            } else {
                loadcache('pluginlanguage_script');
            }
        }
        $returnvalue = & $_G['cache']['pluginlanguage_script'];
        $key = &$file;
    }
    $return = $langvar !== null ? (isset($returnvalue[$key][$langvar]) ? $returnvalue[$key][$langvar] : null) : $returnvalue[$key];
    $return = $return === null ? ($default !== null ? $default : $langvar) : $return;
    $searchs = $replaces = array();
    if($vars && is_array($vars)) {
        foreach($vars as $k => $v) {
            $searchs[] = '{'.$k.'}';
            $replaces[] = $v;
        }
    }
    if(is_string($return) && strpos($return, '{_G/') !== false) {
        preg_match_all('/{_G/(.+?)}/', $return, $gvar);
        foreach($gvar[0] as $k => $v) {
            $searchs[] = $v;
            $replaces[] = getglobal($gvar[1][$k]);
        }
    }
    $return = str_replace($searchs, $replaces, $return);
    return $return;
}