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Reconocer el navegador por PHP

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  1. <?php
  2.  
  3.         function browser_info($agent=null) {
  4.             // Declare known browsers to look for
  5.             $known = array('msie', 'firefox', 'safari', 'webkit', 'opera', 'netscape',
  6.             'konqueror', 'gecko');
  7.  
  8.             // Clean up agent and build regex that matches phrases for known browsers
  9.             // (e.g. "Firefox/2.0" or "MSIE 6.0" (This only matches the major and minor
  10.             // version numbers. E.g. "2.0.0.6" is parsed as simply "2.0"
  11.             $agent = strtolower($agent ? $agent : $_SERVER['HTTP_USER_AGENT']);
  12.             $pattern = '#(?<browser>' . join('|', $known) .
  13.             ')[/ ]+(?<version>[0-9]+(?:\.[0-9]+)?)#';
  14.  
  15.             // Find all phrases (or return empty array if none found)
  16.             if (!preg_match_all($pattern, $agent, $matches)) return array();
  17.  
  18.             // Since some UAs have more than one phrase (e.g Firefox has a Gecko phrase,
  19.             // Opera 7,8 have a MSIE phrase), use the last one found (the right-most one
  20.             // in the UA). That's usually the most correct.
  21.             $i = count($matches['browser'])-1;
  22.             return array($matches['browser'][$i] => $matches['version'][$i],
  23.             'browser' => $matches['browser'][$i],
  24.             'version' => $matches['version'][$i]);                                  
  25.         }
  26.         //get browser info
  27.         $ua = browser_info();
  28.  
  29.         //show what's returned
  30.         if($ua['browser'] === "safari"){
  31.             $var = 2;
  32.         } elseif($ua['browser'] === "msie"){
  33.             $var = 1;
  34.         } elseif($ua['browser'] === "firefox"){
  35.             $var = 1;
  36.         }
  37.     ?>

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