I wasn't sure if 4images had an easy way to do this already, and I needed it, so I set this up on my site.
includes/functions.php
Find
?>
Replace
function browser_info($agent=null) {
// Declare known browsers to look for
$known = array('msie', 'firefox', 'chrome', 'safari', 'webkit', 'opera', 'netscape',
'konqueror', 'gecko');
// Clean up agent and build regex that matches phrases for known browsers
// (e.g. "Firefox/2.0" or "MSIE 6.0" (This only matches the major and minor
// version numbers. E.g. "2.0.0.6" is parsed as simply "2.0"
$agent = strtolower($agent ? $agent : $_SERVER['HTTP_USER_AGENT']);
$pattern = '#(?<browser>' . join('|', $known) .
')[/ ]+(?<version>[0-9]+(?:\.[0-9]+)?)#';
// Find all phrases (or return empty array if none found)
if (!preg_match_all($pattern, $agent, $matches)) return array();
// Since some UAs have more than one phrase (e.g Firefox has a Gecko phrase,
// Opera 7,8 have a MSIE phrase), use the last one found (the right-most one
// in the UA). That's usually the most correct.
$i = count($matches['browser'])-1;
return array($matches['browser'][$i] => $matches['version'][$i]);
}
?>
includes/page_header.php
Find
?>
Replace
$ua = browser_info();
if ($ua['firefox']) {
$doctype = "";
} else {
$doctype = "<!DOCTYPE HTML>";
}
if ($ua['msie']) {
$msie = 1;
} else {
$msie = 0;
}
$site_template->register_vars(array(
"doctype" => $doctype,
"msie" => $msie
)
);
?>
Now use the example to create your own. The examples allow you to display a different DOCTYPE for Firefox using {doctype},
or you can show some html to Internet Explorer users only, by using {if msie} ...my html... {endif msie}
Other check types:
Replace firefox with a browser that we setup in the $known = array
if ($ua['firefox']) ... // true
if ($ua['firefox'] > 3) ... // true
if ($ua['firefox'] > 4) ... // false
if ($ua['browser'] == 'firefox') ... // true
if ($ua['version'] > 3.5) ... // true
Very simple, I know. But very useful. It saved my site from being broken in some browsers by letting me change the doctype, and displaying a message to IE users to get a better browser.
