Exactly.
Quote:
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Originally Posted by PHP Manual
'HTTP_USER_AGENT'
Contents of the User-Agent: header from the current request, if there is one. This is a string denoting the user agent being which is accessing the page. A typical example is: Mozilla/4.5 [en] (X11; U; Linux 2.2.9 i586). Among other things, you can use this value with get_browser() to tailor your page's output to the capabilities of the user agent.
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I use it, myself, for the hacks on the page, but it isn't a done deal. One can also use browser-sniffing or capabilities on the client side, if using client side script.
Example:
if ($firstSub)
{
$outfile [] = '<ul class="';
if ($thisUn || ($browser == "IE")) $outfile [] = 'open';
$outfile [] = 'sub" id="sub">'."\n";
}