I get the message 'Warning: Cannot send session cookie - headers already sent...' or 'Cannot add header information - headers already sent...'.
<<<		 I need to access information in the request header directly. How can I do this? When I try to use authentication with IIS I get 'No Input file specified'.
>>>
9.7 Using PHP
9 FAQ : Foire Aux Questions
 Manuel PHP
.  I would like to write a generic PHP script that can handle data coming from any form. How do I know which POST method variables are available?
.  I need to convert all single-quotes (') to a backslash followed by a single-quote. How can I do this with a regular expression?
.  When I do the following, the output is printed in the wrong order:
.  Hey, what happened to my newlines?
.  I get the message 'Warning: Cannot send session cookie - headers already sent...' or 'Cannot add header information - headers already sent...'.
-> I need to access information in the request header directly. How can I do this?
.  When I try to use authentication with IIS I get 'No Input file specified'.
.  My PHP script works on IE and Lynx, but on Netscape some of my output is missing. When I do a "View Source" I see the content in IE but not in Netscape.
.  How am I supposed to mix XML and PHP? It complains about my <?xml> tags!
.  How can I use PHP with FrontPage or some other HTML editor that insists on moving my code around?
.  Where can I find a complete list of pre-set variables available to me, and why are these not documented in the PHP documentation?
.  I'm trying to access one of the standard CGI variables (such as $DOCUMENT_ROOT or $HTTP_REFERER) in a user-defined function, and it can't seem to find it. What's wrong?

9.7.6 I need to access information in the request header directly. How can I do this?

The getallheaders function will do this if you are running PHP as an Apache module. So, the following bit of code will show you all the request headers: 


$headers = getallheaders();
foreach ($headers as $name => $content) {
    echo "headers[$name] = $content<br>\n";
}

<< I need to access information in the request header directly. How can I do this? >>
I get the message 'Warning: Cannot send session cookie - headers already sent...' or 'Cannot add header information - headers already sent...'. Using PHP When I try to use authentication with IIS I get 'No Input file specified'.