标题 "Discuz 修改网站首页为插件或别的链接为首页的方法1" 描述的是如何在 Discuz 论坛系统中更改默认的首页，使其指向一个插件或其他特定链接，特别是针对电脑版和手机版的不同操作方法。这里我们将详细讲解这两个版本的修改步骤。
对于电脑版的 Discuz 论坛，修改过程非常直接。您只需要通过论坛后台的界面导航来完成。通常，Discuz 提供了这样的功能，允许管理员自定义首页。进入后台管理界面，找到相应的设置选项，然后输入您希望设为首页的链接即可。这个过程涉及到的主要是论坛系统的用户界面配置，具体步骤可能会根据 Discuz 版本的差异有所不同，但基本操作都是在后台进行。
而对于手机版的 Discuz，修改方法稍微复杂一些，需要直接编辑代码。您需要访问网站根目录下的 `index.php` 文件。在这个文件中，您将在 `<?php` 之后的注释下方添加一段代码，这段代码将决定当用户使用移动设备访问网站时被重定向到的页面。下面是一个示例代码：
```php
if(it618_is_mobile()){ // 手机访问时跳转
header("location:你想设置的插件链接");
exit;
}
function it618_is_mobile(){
$user_agent = $_SERVER['HTTP_USER_AGENT'];
$mobile_agents = Array(
"240x320","acer","acoon","acs-","abacho","ahong","airness","alcatel","amoi","android","anywhereyougo.com","applewebkit/525","applewebkit/532","asus","audio","au-mic","avantogo","becker","benq","bilbo","bird","blackberry","blazer","bleu","cdm-","compal","coolpad","danger","dbtel","dopod","elaine","eric","etouch","fly ","fly_","fly-","go.web","goodaccess","gradiente","grundig","haier","hedy","hitachi","htc","huawei","hutchison","inno","ipad","ipaq","ipod","jbrowser","kddi","kgt","kwc","lenovo","lg ","lg2","lg3","lg4","lg5","lg7","lg8","lg9","lg-","lge-","lge9","longcos","maemo","mercator","meridian","micromax","midp","mini","mitsu","mmm","mmp","mobi","mot-","moto","nec-","netfront","newgen","nexian","nf-browser","nintendo","nitro","nokia","nook","novarra","obigo","palm","panasonic","pantech","philips","phone","pg-","playstation","pocket","pt-","qc-","qtek","rover","sagem","sama","samu","sanyo","samsung","sch-","scooter","sec-","sendo","sgh-","sharp","siemens","sie-","softbank","sony","spice","sprint","spv","symbian","tablet","talkabout","tcl-","teleca","telit","tianyu","tim-","toshiba","tsm","up.browser","utec","utstar","verykool","virgin","vk-","voda","voxtel","vx","wap","wellco","wig browser","wii","windows ce","wireless","xda","xde","zte"
);
$is_mobile = false;
foreach ($mobile_agents as $device) {
if (stristr($user_agent, $device)) {
$is_mobile = true;
break;
}
}
return $is_mobile;
}
```
这段代码中，`it618_is_mobile()` 函数用于检测用户是否使用移动设备。如果用户是通过手机或平板设备访问，函数会返回 `true`，然后 `if` 语句会执行，将用户重定向到您设定的链接（需要替换 `你想设置的插件链接`）。这个列表包含了常见的移动设备标识符，确保大多数移动浏览器都能被正确识别。
如果在设置后发现无法访问插件首页，而被强制跳转回论坛页面，可能是因为 Discuz 的某些设置或更新导致的问题。这种情况下，您可以参考另一个教程：“Discuz3.2 及以上版本 开启手机版后访问 it618 插件手机版自动跳转到论坛的解决方法”，该教程将指导您解决这类问题。
要改变 Discuz 论坛的首页，需要对后台设置有一定的了解，并且熟悉 PHP 代码的编辑。对于手机版，还需要对移动设备的用户代理字符串有一定认识，以便正确地检测并重定向移动用户。确保在修改代码前备份相关文件，以防止出现意外错误。
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