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copied!<ul> <li><p>The <a href="http://php.net/manual/en/function.get-browser.php" rel="nofollow">get_browser()</a> function <em>attempts to determine</em> the browser's features (in array) but dont count too much on it because of the <code>non standard user-agents</code>; instead, for a serious app, build your own.</p></li> <li><p>the <code>$_SERVER["HTTP_USER_AGENT"]</code> is a long string "describing" the user's browser and can be used as first parameter in the above function (optional); <strong>A tip</strong>: use this one to uncover user's browser instead of get_browser() itself! Also be prepared for a <em>missing</em> user agent as well! An example of this string is this:<br> <strong>Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en) AppleWebKit/418 (KHTML, like Gecko) Safari/417.9.3</strong></p></li> <li><p>a search engine or robot or spider or crawler that <a href="http://www.cs.washington.edu/lab/policies/draft/crawlers.html" rel="nofollow">follows the rules</a> will visit your page according to the information stored of <strong>robots.txt</strong> that must exist in your site's root. Without a robots.txt a <em>spider can crawl the whole site</em>, as long as it find <strong>links</strong> inside your pages; if you have this file you can program it so to tell the spider <strong>what</strong> to search; <strong>NOTE:</strong> this rule applies only to "good" spiders and not the <a href="http://www.w3.org/wiki/Bad_RDF_Crawlers" rel="nofollow">bad ones</a></p></li> </ul>

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