How can I detect the browser with PHP or JavaScript?

Question

How can I detect if the user is not using any of the browsers Chrome, Firefox or Internet Explorer using JavaScript or PHP?

Answer 1

The best way to do this in JS I found is on Quirksmode. I made one for PHP which should work with common browsers :

  $browser = array(
    'version'   => '0.0.0',
    'majorver'  => 0,
    'minorver'  => 0,
    'build'     => 0,
    'name'      => 'unknown',
    'useragent' => ''
  );

  $browsers = array(
    'firefox', 'msie', 'opera', 'chrome', 'safari', 'mozilla', 'seamonkey', 'konqueror', 'netscape',
    'gecko', 'navigator', 'mosaic', 'lynx', 'amaya', 'omniweb', 'avant', 'camino', 'flock', 'aol'
  );

  if (isset($_SERVER['HTTP_USER_AGENT'])) {
    $browser['useragent'] = $_SERVER['HTTP_USER_AGENT'];
    $user_agent = strtolower($browser['useragent']);
    foreach($browsers as $_browser) {
      if (preg_match("/($_browser)[\/ ]?([0-9.]*)/", $user_agent, $match)) {
        $browser['name'] = $match[1];
        $browser['version'] = $match[2];
        @list($browser['majorver'], $browser['minorver'], $browser['build']) = explode('.', $browser['version']);
        break;
      }
    }
  }

Answer 2

Here is JavaScript code through which you can easily detect the browser.

    var userAgent = navigator.userAgent.toLowerCase();

    // Figure out what browser is being used.
    var Browser = {
        Version: (userAgent.match(/.+(?:rv|it|ra|ie)[\/: ]([\d.]+)/) || [])[1],
        Chrome: /chrome/.test(userAgent),
        Safari: /webkit/.test(userAgent),
        Opera: /opera/.test(userAgent),
        IE: /msie/.test(userAgent) && !/opera/.test(userAgent),
        Mozilla: /mozilla/.test(userAgent) && !/(compatible|webkit)/.test(userAgent),
        Check: function() { alert(userAgent); }
    };

    if (Browser.Chrome || Browser.Mozilla) {
        // Do your stuff for Firefox and Chrome.
    }
    else if (Browser.IE) {
        // Do something related to Internet Explorer.
    }
    else {
        // The browser is Safari, Opera or some other.
    }