PHP判断是否为手机端访问

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; 
}

//调用

if(is_mobile_request()){
    //手机访问代码
}else{
    //非手机访问代码
}
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