php判断手机访问还是电脑访问示例分享

<?php
function ismobile(){ 
 $useragent=isset($_server['http_user_agent']) ? $_server['http_user_agent'] : ''; 
 $useragent_commentsblock=preg_match('|\(.*?\)|',$useragent,$matches)>0?$matches[0]:'';    
 function checksubstrs($substrs,$text){ 
  foreach($substrs as $substr) 
   if(false!==strpos($text,$substr)){ 
    return true; 
   } 
   return false; 
 }
 $mobile_os_list=array('google wireless transcoder','windows ce','windowsce','symbian','android','armv6l','armv5','mobile','centos','mowser','avantgo','opera mobi','j2me/midp','smartphone','go.web','palm','ipaq');
 $mobile_token_list=array('profile/midp','configuration/cldc-','160×160','176×220','240×240','240×320','320×240','up.browser','up.link','symbianos','palmos','pocketpc','sonyericsson','nokia','blackberry','vodafone','benq','novarra-vision','iris','netfront','htc_','xda_','samsung-sgh','wapaka','docomo','iphone','ipod'); 

 $found_mobile=checksubstrs($mobile_os_list,$useragent_commentsblock) || 
     checksubstrs($mobile_token_list,$useragent); 

 if ($found_mobile){ 
  return true; 
 }else{ 
  return false; 
 } 
}
if (ismobile())
 echo '手机登录m.jb51.com';
else
 echo '电脑登录www.jb51.com';
?>