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if((ereg("Nav", getenv("HTTP_USER_AGENT"))) || (ereg("Gold", getenv("HTTP_USER_AGENT"))) || (ereg("X11", getenv("HTTP_USER_AGENT"))) || (ereg("Mozilla", getenv("HTTP_USER_AGENT"))) || (ereg("Netscape", getenv("HTTP_USER_AGENT"))) AND (!ereg("MSIE", getenv("HTTP_USER_AGENT")) AND (!ereg("Konqueror", getenv("HTTP_USER_AGENT"))))) $browser = "Netscape";
elseif(ereg("MSIE", getenv("HTTP_USER_AGENT"))) $browser = "MSIE";
elseif(ereg("Lynx", getenv("HTTP_USER_AGENT"))) $browser = "Lynx";
elseif(ereg("Opera", getenv("HTTP_USER_AGENT"))) $browser = "Opera";
elseif(ereg("WebTV", getenv("HTTP_USER_AGENT"))) $browser = "WebTV";
elseif(ereg("Konqueror", getenv("HTTP_USER_AGENT"))) $browser = "Konqueror";
elseif((eregi("bot", getenv("HTTP_USER_AGENT"))) || (ereg("Google", getenv("HTTP_USER_AGENT"))) || (ereg("Slurp", getenv("HTTP_USER_AGENT"))) || (ereg("Scooter", getenv("HTTP_USER_AGENT"))) || (eregi("Spider", getenv("HTTP_USER_AGENT"))) || (eregi("Infoseek", getenv("HTTP_USER_AGENT")))) $browser = "Bot";
else $browser = "Other";


this will return the browser name in $browser

and you can have a test at http://www.botsvsbrowsers.com/SimulateUserAgent.asp.

example:

if(ereg(“Google”, getenv(“HTTP_USER_AGENT”))) $browser = “Bot”;
else $browser = “Other”; 

echo $browser;