function isMobileDev(){
    if(!empty($_SERVER['HTTP_USER_AGENT'])){
       $user_ag = $_SERVER['HTTP_USER_AGENT'];
       if(preg_match('/(Mobile|Android|Tablet|GoBrowser|[0-9]x[0-9]*|uZardWeb\/|Mini|Doris\/|Skyfire\/|iPhone|Fennec\/|Maemo|Iris\/|CLDC\-|Mobi\/)/uis',$user_ag)){
          return true;
       };
    };
    return false;
}

function isMobileDev(){
    if(!empty($_SERVER['HTTP_USER_AGENT'])){
       $user_ag = $_SERVER['HTTP_USER_AGENT'];
       if(preg_match('/(Mobile|Android|Tablet|GoBrowser|[0-9]x[0-9]*|uZardWeb\/|Mini|Doris\/|Skyfire\/|iPhone|Fennec\/|Maemo|Iris\/|CLDC\-|Mobi\/)/uis',$user_ag)){
          return true;
       };
    };
    return false;
}

如果您的服务器支持get_browser(自PHP 4起可用)，则非常简单。它们有一个内置的功能来满足你的要求。

参考:https://www.php.net/manual/en/function.get-browser.php

<?php
$browser = get_browser(null, true);
if($browser['ismobiledevice']) { 
      // Device is mobile 
}
?>

一个更简单的解决方案似乎在大多数情况下都有效:

function funcDeviceType() {

 // INFO ABOUT THE BROWSER/DEVICE USER IS VISITING ON
 $useragent = $_SERVER["HTTP_USER_AGENT"]; 

 if(stripos($useragent, "mobile")!== false){
      return "mobile device";
  }else{
      return "desktop or laptop computer";
  }
}

简单地，你可以点击链接。它非常简单，很容易使用。我在用这个。它工作得很好。

http://mobiledetect.net/

像这样使用

//include the file
require_once 'Mobile_Detect.php';
$detect = new Mobile_Detect;

// Any mobile device (phones or tablets).
if ( $detect->isMobile() ) {
 //do some code
}

// Any tablet device.
if( $detect->isTablet() ){
 //do some code
}

<?php 

//-- Very simple way
$useragent = $_SERVER['HTTP_USER_AGENT']; 
$iPod = stripos($useragent, "iPod"); 
$iPad = stripos($useragent, "iPad"); 
$iPhone = stripos($useragent, "iPhone");
$Android = stripos($useragent, "Android"); 
$iOS = stripos($useragent, "iOS");
//-- You can add billion devices 

$DEVICE = ($iPod||$iPad||$iPhone||$Android||$iOS);

if (!$DEVICE) { ?>

<!-- What you want for all non-mobile devices. Anything with all HTML, PHP, CSS, even full page codes-->

<?php }else{ ?> 

<!-- What you want for all mobile devices. Anything with all HTML, PHP, CSS, even full page codes --> 

<?php } ?>