php版：

<?php
$ua=$_SERVER['HTTP_USER_AGENT'];
$ua=strtolower($ua);
if($ua!="" &&strpos($ua,"baiduspider")){
    if(strpos($ua,"android") || strpos($ua,"mobile")){
        echo "是百度移动UA";
    }else{
        echo "是百度PCUA";
    }
}else{
    echo"不是baiduspider UA";
}
?>