reasonableframework/helper/mobiletool.php

<?php
/**
 * @file mobiletool.php
 * @date 2019-04-29
 * @author Go Namhyeon <gnh1201@gmail.com>
 * @brief Mobile Tool
 * @documentation https://www.w3.org/Mobile/training/device-detection/mobile_detector.txt
 */

if(check_function_exists("detect_mobile")) {
  function detect_mobile() {
      // This function returns the value of a local variable ($mb)
      // that is 0 if a desktop client is detected and > 0 for mobile.
      // Adapted only very lightly from original code posted PascalV in response to 
      // the lightweight device detection (http://mobiforge.com/developing/story/lightweight-device-detection-php)

      $mb = 0;

     if(preg_match('/(up.browser|up.link|mmp|symbian|smartphone|midp|wap|phone)/i', strtolower($_SERVER['HTTP_USER_AGENT']))) {
       $mb++;
     }

     if((strpos(strtolower($_SERVER['HTTP_ACCEPT']),'application/vnd.wap.xhtml+xml')>0) or ((isset($_SERVER['HTTP_X_WAP_PROFILE']) or isset($_SERVER['HTTP_PROFILE'])))) {
       $mb++;
     }    

     $mobile_ua = strtolower(substr($_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)) {
       $mb++;
     }

     if (strpos(strtolower($_SERVER['ALL_HTTP']),'operamini')>0) {
       $mb++;
     }

     if (strpos(strtolower($_SERVER['HTTP_USER_AGENT']),' ppc;')>0) {
       $mb++;
     }

     if (strpos(strtolower($_SERVER['HTTP_USER_AGENT']),'windows ce')>0) {
       $mb++;
     } else if (strpos(strtolower($_SERVER['HTTP_USER_AGENT']),'windows')>0) {
       $mb=0;
     }

     if (strpos(strtolower($_SERVER['HTTP_USER_AGENT']),'iemobile')>0) {
       $mb++;
     }

     return $mb;
   }
 }