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With the blaze of the iPhone and other similarly enabled "web" phones, companies such as Bank of America, ABC News, Flickr and Orbitz.com have made an extra effort to make their exceptional websites available across these smaller platforms.

These sites present their content in a slightly different way. They can present more "design" than previous "WAP" enabled phones, but slight less "action" than our normal heavy-hitter browsers can process.

With the improvement of these new mobile web browsers, mobile web content only needs to meet the basic HTML / Javascript standards. These slight differences allow for greater creativity and less overhead in translation costs. Most developers can easily implement a switch that can present a downgraded version of the original website. The method in which they do this can vary based on server configurations. Although there are several methods readily available through a google search, the code below, created by Andy Moore and updated by dev.mobi, is a great light PHP script.

The "proper" way to do this is to use a full device database such as WURFL (and we have an article on how to do this) - dev.MOBI

If you can't implement WURL (or similar) then maybe one or both scripts below can help redirect you visitors to your new mobile web site. 

TEST THE SCRIPTS HERE

Script ONE (includes header and agents test)

<?php

$mobile_browser = '0';

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

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

if (strpos(strtolower($_SERVER['HTTP_USER_AGENT']),'windows')>0) {
    $mobile_browser=0;
    }


if($mobile_browser>0){

   // do something

   } else {

   // do something else

   }

   
?>

Script TWO (includes a simple header detection test)

<?php
/*
SHARED LICENSE - VISIT ANDYMOORE.info
*/

function detect_mobile_device(){
  // check if the user agent value claims to be windows but not windows mobile
  if(stristr($_SERVER['HTTP_USER_AGENT'],'windows')&&!stristr($_SERVER['HTTP_USER_AGENT'],'windows ce')){
    return false;
  }

  // check if the user agent gives away any tell tale signs it's a mobile browser

  if(eregi('up.browser|up.link|windows ce|iemobile|mini|mmp|symbian|midp|wap|phone|pocket|mobile|pda|psp',$_SERVER['HTTP_USER_AGENT'])){

    return true;

  }

  // check the http accept header to see if wap.wml or wap.xhtml support is claimed

  if(stristr($_SERVER['HTTP_ACCEPT'],'text/vnd.wap.wml')||stristr($_SERVER['HTTP_ACCEPT'],'application/vnd.wap.xhtml+xml')){

    return true;

  }

  // check if there are any tell tales signs it's a mobile device from the _server headers

  if(isset($_SERVER['HTTP_X_WAP_PROFILE'])||isset($_SERVER['HTTP_PROFILE'])||isset($_SERVER['X-OperaMini-Features'])||isset($_SERVER['UA-pixels'])){

    return true;

  }

  // build an array with the first four characters from the most common mobile user agents

  $a = array('acs-','alav','alca','amoi','audi','aste','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','opwv','palm','pana','pant','pdxg','phil','play','pluc','port','prox','qtek','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','w3c ','wap-','wapa','wapi','wapp','wapr','webc','winw','winw','xda','xda-');

  // check if the first four characters of the current user agent are set as a key in the array

  if(isset($a[substr($_SERVER['HTTP_USER_AGENT'],0,4)])){

    return true;

  }

}



// example 1 - detect and redirect mobile browsers

if(detect_mobile_device()){

  header('Location: http://andymoore.mobi/');

  exit;

}



// example 2 - detect and redirect desktop browsers

if(!detect_mobile_device()){

  header('Location: http://andymoore.info/');

  exit;

}

?>