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Those array indices will only appear in certain cases:<br />
<br />
PHP_AUTH_* variables are only in the $_SERVER array if the user has entered HTTP authentication<br />
<br />
HTTP_REFERRER is not set if there is no referrer, i.e. if you just type in a URL directly, or the visitor's browser doesn't do referrals for some reason.<br />

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To get a better picture of things, I recommend just doing a <br />
print_r($_SERVER);<br />
<br />
that willl show you all the contents of the array.
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give me an example script to use PHP_AUTH_* variables I have tried several different ones with the HTTP authentication but perhaps I am doing it wrong
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Nevermind I just found a page that says<br />
Also note that this does not work using Microsoft's IIS server and the CGI version of PHP due to a limitation of IIS<br />
<br />
I tried to use the Module version with the Apache server but the server would not start when I did this
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ah, too bad... I'm not sure how you'd get that information from an IIS webserver.
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Its not an IIS server but it is an apache server running on windows and I configured it to use CGI with PHP because I could not load a module through the http.conf file<br />
It keeps telling me the file php4apache.dll could not be found even though it is definitely in that location dont know why.
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<div class="content wysiwyg-content">
I am receiving the following error:<br />
<br />
Notice: Undefinded index: <br />
I receive this error only on these variables<br />
&nbsp; &nbsp; &nbsp; $_Server[&quot;PHP_AUTH_USER&quot;]<br />
&nbsp; &nbsp; &nbsp; $_Server[&quot;PHP_AUTH_PW&quot;]<br />
&nbsp; &nbsp; &nbsp; $_Server[&quot;AUTH_TYPE&quot;]<br />
&nbsp; &nbsp; &nbsp; $_Server[&quot;HTTP_ACCEPT_CHAR<wbr />SET&quot;]<br />
&nbsp; &nbsp; &nbsp; $_Server[&quot;HTTP_REFERER&quot;]<br />
&nbsp; &nbsp; &nbsp; $_Server[&quot;REMOTE_HOST&quot;]<br />
I have tested all the other Server Variables and they work fine.<br />
&nbsp; &nbsp; &nbsp; &nbsp;i.e. <br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; $_Server[&quot;REMOTE_PORT&quot;]<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; $_Server[&quot;SERVER_PORT&quot;]<br />
&nbsp; &nbsp; &nbsp; and so on... <br />
&nbsp; &nbsp; &nbsp; these have no problems<br />
<br />
I am running Apache_2.0.47-win32-x86-no<wbr />_ssl Server on Windows NT<br />
and PHP version 4.3.3<br />
I have altered C:\Winnt\php.ini to<br />
&nbsp; &nbsp; &nbsp;register_globals = On<br />
I have also tried to use HTTP_SERVER_VARS instead of _SERVER and it returns the exact same errors on the same Variables<br />
I have also tried $PHP_AUTH_USER does not work either<br />
I have found several places where people have said they were having the same problem but the solutions did not work for me.<br />
Please help!
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I am receiving the following error:

Notice: Undefinded index: 
I receive this error only on these variables
      $_Server["PHP_AUTH_USER"]
      $_Server["PHP_AUTH_PW"]
      $_Server["AUTH_TYPE"]
      $_Server["HTTP_ACCEPT_CHARSET"]
      $_Server["HTTP_REFERER"]
      $_Server["REMOTE_HOST"]
I have tested all the other Server Variables and they work fine.
       i.e. 
          $_Server["REMOTE_PORT"]
          $_Server["SERVER_PORT"]
      and so on... 
      these have no problems

I am running Apache_2.0.47-win32-x86-no_ssl Server on Windows NT
and PHP version 4.3.3
I have altered C:\Winnt\php.ini to
     register_globals = On
I have also tried to use HTTP_SERVER_VARS instead of _SERVER and it returns the exact same errors on the same Variables
I have also tried $PHP_AUTH_USER does not work either
I have found several places where people have said they were having the same problem but the solutions did not work for me.
Please help!

Undefined Index when using $_SERVER

PHP is a widely-used server-side scripting language especially suited for web development, powering tens of millions of sites from Facebook to personal WordPress blogs. PHP is often paired with the MySQL relational database, but includes support for most other mainstream databases. By utilizing different Server APIs, PHP can work on many different web servers as a server-side scripting language.