php判断用户是否手机访问代码

$agent = check_wap();
if( $agent )
{
 header(Location: http://www.jb51.net);
 exit;
}
// check if wap
function check_wap(){
 // 先检查是否为wap代理，准确度高
 if(stristr($_SERVER[HTTP_VIA],"wap")){
   return true;
 }
 // 检查浏览器是否接受 WML.
 elseif(strpos(strtoupper($_SERVER[HTTP_ACCEPT]),"VND.WAP.WML") > 0){
   return true;
 }
 //检查USER_AGENT
 elseif(preg_match(/(blackberry|configuration\/cldc|hp |hp-|htc |htc_|htc-|iemobile|kindle|midp|mmp|motorola|mobile|nokia|opera mini|opera |Googlebot-Mobile|YahooSeeker\/M1A1-R2D2|android|iphone|ipod|mobi|palm|palmos|pocket|portalmmm|ppc;|smartphone|sonyericsson|sqh|spv|symbian|treo|up.browser|up.link|vodafone|windows ce|xda |xda_)/i, $_SERVER[HTTP_USER_AGENT])){
   return true;      
 }
 else{
   return false; 
 }
}

function is_mobile_request() 
{ 
$_SERVER[ALL_HTTP] = isset($_SERVER[ALL_HTTP]) ? $_SERVER[ALL_HTTP] : ; 
$mobile_browser = 0; 
if(preg_match(/(up.browser|up.link|mmp|symbian|smartphone|midp|wap|phone|iphone|ipad|ipod|android|xoom)/i, strtolower($_SERVER[HTTP_USER_AGENT]))) 
 $mobile_browser++; 
if((isset($_SERVER[HTTP_ACCEPT])) and (strpos(strtolower($_SERVER[HTTP_ACCEPT]),application/vnd.wap.xhtml+xml) !== false)) 
 $mobile_browser++; 
if(isset($_SERVER[HTTP_X_WAP_PROFILE])) 
 $mobile_browser++; 
if(isset($_SERVER[HTTP_PROFILE])) 
 $mobile_browser++; 
$mobile_ua = strtolower(substr($_SERVER[HTTP_USER_AGENT],0,4)); 
$mobile_agents = array( 
   w3c ,acs-,alav,alca,amoi,audi,avan,benq,bird,blac, 
   blaz,brew,cell,cldc,cmd-,dang,doco,eric,hipt,inno, 
   ipaq,java,jigs,kddi,keji,leno,lg-c,lg-d,lg-g,lge-, 
   maui,maxo,midp,mits,mmef,mobi,mot-,moto,mwbp,nec-, 
   newt,noki,oper,palm,pana,pant,phil,play,port,prox, 
   qwap,sage,sams,sany,sch-,sec-,send,seri,sgh-,shar, 
   sie-,siem,smal,smar,sony,sph-,symb,t-mo,teli,tim-, 
   tosh,tsm-,upg1,upsi,vk-v,voda,wap-,wapa,wapi,wapp, 
   wapr,webc,winw,winw,xda,xda- 
   ); 
if(in_array($mobile_ua, $mobile_agents)) 
 $mobile_browser++; 
if(strpos(strtolower($_SERVER[ALL_HTTP]), operamini) !== false) 
 $mobile_browser++; 
// Pre-final check to reset everything if the user is on Windows 
if(strpos(strtolower($_SERVER[HTTP_USER_AGENT]), windows) !== false) 
 $mobile_browser=0; 
// But WP7 is also Windows, with a slightly different characteristic 
if(strpos(strtolower($_SERVER[HTTP_USER_AGENT]), windows phone) !== false) 
 $mobile_browser++; 
if($mobile_browser>0) 
 return true; 
else
 return false; 
}

function isPhone() {
  // 如果有HTTP_X_WAP_PROFILE则一定是移动设备
  if (isset($_SERVER[HTTP_X_WAP_PROFILE])) {
    return true;
  }
  //如果via信息含有wap则一定是移动设备,部分服务商会屏蔽该信息
  if (isset($_SERVER[HTTP_VIA])) {
    //找不到为flase,否则为true
    if(stristr($_SERVER[HTTP_VIA], "wap"))
    {
      return true;
    }
  }
  //脑残法，判断手机发送的客户端标志,兼容性有待提高
  if (isset($_SERVER[HTTP_USER_AGENT])) {
    $clientkeywords = array (
      nokia,
      sony,
      ericsson,
      mot,
      samsung,
      htc,
      sgh,
      lg,
      sharp,
      sie-,
      philips,
      panasonic,
      alcatel,
      lenovo,
      iphone,
      ipod,
      blackberry,
      meizu,
      android,
      netfront,
      symbian,
      ucweb,
      windowsce,
      palm,
      operamini,
      operamobi,
      openwave,
      nexusone,
      cldc,
      midp,
      wap,
      mobile,
      phone,
    );
    // 从HTTP_USER_AGENT中查找手机浏览器的关键字
    if (preg_match("/(" . implode(|, $clientkeywords) . ")/i", strtolower($_SERVER[HTTP_USER_AGENT]))) {
      return true;
    }
  }
  //协议法，因为有可能不准确，放到最后判断
  if (isset($_SERVER[HTTP_ACCEPT])) {
    // 如果只支持wml并且不支持html那一定是移动设备
    // 如果支持wml和html但是wml在html之前则是移动设备
    if ((strpos($_SERVER[HTTP_ACCEPT], vnd.wap.wml) !== false) && (strpos($_SERVER[HTTP_ACCEPT], text/html) === false || (strpos($_SERVER[HTTP_ACCEPT], vnd.wap.wml) < strpos($_SERVER[HTTP_ACCEPT], text/html)))) {
      return true;
    }
  }
  return false;
}