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PHP如何检测手机是什么系统？PHP如何通过UserAgent判断智能手机系统(设备,Android,IOS系统)？

auto.php

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header("Content-type:text/html; charset=utf-8");

$user_agent = $_SERVER['HTTP_USER_AGENT'];

   //var_dump($user_agent);

if(stristr($_SERVER['HTTP_USER_AGENT'],'Android')) {

   //echo '你的手机是：Android系统';

header('Location: http://www.test.com/wap/android/test_1.3.apk'); 

}else if(stristr($_SERVER['HTTP_USER_AGENT'],'iPhone')){

   //echo '你的手机是：ISO系统';

header('Location: http://itunes.apple.com/cn/appid493887471?mt=8');

}else{

   //echo '你使用的是其他系统';

header('Location: http://m.test.com/');

}