title: Using Wurfl to detect mobile screen resolution?
body: <p>I've implemented Wurfl, but the problem with this is that it's giving me the wrong screen resolution for my phones. How accurate is wurfl and I do not know what I'm doing wrong.</p>
  
  <pre><code>require_once 'wurfl_config.php';
  
  require_once WURFL_CLASS_FILE;
  
  $ua = strtolower($_SERVER['HTTP_USER_AGENT']);
  
  
  $wurflObj = new wurfl_class();
  $wurflObj-&gt;GetDeviceCapabilitiesFromAgent($ua);
  
  $width = $wurflObj-&gt;capabilities['display']['resolution_width'];
  
  //Config file
      // Single define to be checked when starting the parser and/or the class
  define("WURFL_CONFIG", true);
  
  // Where all data is stored (wurfl.xml, cache file, logs, etc)
  $data = '/var/www/html/includes/wurfl/';
  define("DATADIR", $data);
  
  // Path and filename of wurfl_parser.php
  define("WURFL_PARSER_FILE", 'wurfl_parser.php');
  
  // Path and filename of wurfl_class.php
  define("WURFL_CLASS_FILE", 'wurfl_class.php');
  
  // Path and name of the wurfl
  define ("WURFL_FILE", DATADIR."wurfl.xml");
  
  // Path and name of the log file
  define ("WURFL_LOG_FILE", DATADIR."wurfl.log");
  
  // suggested log level for normal use (default PHP logging constants)
  //define ("LOG_LEVEL", LOG_ERROR );
  // suggested log level for debug use
  define ("LOG_LEVEL", LOG_INFO);
  
  // Set this true if you want to use cache. Strongly suggested
  define ("WURFL_USE_CACHE", true);
  
  // Set this true if you want to avoid using cache.php file, and
  // generate a single file for each device user agent and use that as a cache
  // NOTICE: using Multicache will still generate cache.php and agent2id.php,
  //  but will not dump the entire XML as PHP into cache.php. As a result
  //  cache.php will be MUCH smaller and load WAY faster; as a drawback you will
  //  have many more I/O accesses to the single tiny files.
  define ("WURFL_USE_MULTICACHE", true);
  
  // Path and name of the cache file
  define ("CACHE_FILE", DATADIR."cache.php");
  
  // Set path of the Multicache directory where all the little caches will be
  // stored. Should be a directory that contains *only* these files, so that its
  // content can be safely cleaned when a new cache is created.
  // If not using Multicache, this parameter will not be used.
  define ("MULTICACHE_DIR", DATADIR."multicache/");
  
  // Temporary directory for manual updates.
  define ("MULTICACHE_TMP_DIR", DATADIR."multicache_tmp/");
  // This file is created and removed when manually updating multicache files
  define ("MULTICACHE_TOUCH", DATADIR."multicache.lockfile");
  
  // File suffix for Multicache files
  define ("MULTICACHE_SUFFIX",".php");
  
  // Autoload set to false, I will load it when needed
  define ("WURFL_AUTOLOAD", false);
  
  // This parameter tells the class to automatically update cache files when a
  // new XML is found.
  // Using the multicache is not suggested to automatically update it. Use the
  // external scripts.
  define ("WURFL_CACHE_AUTOUPDATE", true);
  
  // Path and name of the file to store user_agent-&gt;id relation
  // (ignored if caching is disabled)
  define ("WURFL_AGENT2ID_FILE", DATADIR."agent2id.php4");
  
  // Configure a patch file
  define("WURFL_PATCH_FILE", DATADIR.'wurfl_patch.xml');
  define("WURFL_PATCH_DEBUG", false);
  
  //define("WURFL_PATCH_FILE", DATADIR.'web_browsers_patch.xml');
  
  // Set the maximum number of user_agents to cache
  define ("MAX_UA_CACHE", 30);
  </code></pre>
  
  <p>Is this a known issue that the incorrect width is being returned, or do I do something wrong?</p>