函数判断是否为手机端访问

// 函数判断是否为手机端访问
    public function client_judge(){
        $_SERVER['ALL_HTTP'] = isset($_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; 
    }