这是一段php通用的判断移动浏览器的函数,原理比较简单,就是判断浏览器返回的user_agent,条件包括手机系统,品牌和窗口大小.
以wordpress为例,在主题的function.php内加上如下代码,我找了一些常见移动浏览器的useragent,其中有很多国内流行的手机浏览器,基本上可以涵盖可能会用手机上网的用户群了..

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function is_mobile() {
$user_agent = $_SERVER['HTTP_USER_AGENT'];
$mobile_browser = Array(
"mqqbrowser", //手机QQ浏览器
"opera mobi", //手机opera
"juc","iuc",//uc浏览器
"fennec","ios","applewebKit/420","applewebkit/525","applewebkit/532","ipad","iphone","ipaq","ipod",
"iemobile", "windows ce",//windows phone
"240x320","480x640","acer","android","anywhereyougo.com","asus","audio","blackberry","blazer","coolpad" ,"dopod", "etouch", "hitachi","htc","huawei", "jbrowser", "lenovo","lg","lg-","lge-","lge", "mobi","moto","nokia","phone","samsung","sony","symbian","tablet","tianyu","wap","xda","xde","zte"
);
$is_mobile = false;
foreach ($mobile_browser as $device) {
if (stristr($user_agent, $device)) {
$is_mobile = true;
break;
}
}
return $is_mobile;
}

然后在主题任意模板如顶部加上如下判断:

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<?php if (is_mobile() ): ?>
//怎样怎样..(这里可以添加一个mobile.css,如<link rel="stylesheet" type="text/css" media="all" href="<?php echo get_template_directory_uri(); ?>/mobile.css" />)
<?php endif ;?>

还需要注意的一点：不管是单独的WordPress主题还是自适应主题，都需要在头部<head>将添加下面meta，否者可能导致手机显示字体过小等问题。

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<meta name="viewport" content="width=device-width"/>