Up to and including 4.1.1 you have to set doc_root to an non empty value if you configure PHP for CGI usage with --enable-discard-path.
CGI and command line setups
By default, PHP is built as both a CLI and CGI program, which can be used for CGI processing. If you are running a web server that PHP has module support for, you should generally go for that solution for performance reasons. However, the CGI version enables users to run different PHP-enabled pages under different user-ids.
Un server configurat în regim CGI este susceptibil câtorva atacuri posibile. Vă rugăm să citiți secțiunea despre securitatea CGI pentru a afla cum să vă apărați de astfel de atacuri.
If you have built PHP as a CGI program, you may test your build by typing make test. It is always a good idea to test your build. This way you may catch a problem with PHP on your platform early instead of having to struggle with it later.
Some server supplied environment variables are not defined in the current » CGI/1.1 specification. Only the following variables are defined there: AUTH_TYPE, CONTENT_LENGTH, CONTENT_TYPE, GATEWAY_INTERFACE, PATH_INFO, PATH_TRANSLATED, QUERY_STRING, REMOTE_ADDR, REMOTE_HOST, REMOTE_IDENT, REMOTE_USER, REQUEST_METHOD, SCRIPT_NAME, SERVER_NAME, SERVER_PORT, SERVER_PROTOCOL, and SERVER_SOFTWARE. Everything else should be treated as 'vendor extensions'.
Have noticed on debian now, and may be true of other builds, that if you are using php as a command line language, you don't need the -q ie: #!/usr/bin/php -q anymore.
What really took me ages to work out was how to the use php in cgi mode (ie in a cgi-bin directory) as it doesn't send http headers by default. It also fails to populate $_GET and $_POST arrays.
Turns out debian php build comes with /usr/bin/php-cgi
Use this in your shebang if running CGI scripts!
I understand now - but had to figure this out myself!
Keywords I tried to solve this problem with were:
PHP, CGI, no $_GET array, Premature end of script headers, No http Headers, debian
Hopefully this post might save someone many hours of frustration, if they are googling the above words!
additionnal information to fastcgi...
the compilation of fastcgi library is not nessesary, php include a modified version of this library,
and fastcgi module have this own implementation of the protocole fastcgi...
on the first server (where apache are!) the uid and gid of apache instance of the fastcgi module
must be the same on the php file to execute...
without that they dont work...
the module refuse to send the request to the fastcgi php server...
Dug out from the discussion at the site below is a good tip: if you are working with an existing PHP installation which did not build either the commandline or CGI servers, you can use the lynx non-graphical web browser to get the web server to execute php scripts from the command line (or cron jobs, etc):
lynx -dump http://whatever
>If you wish to use PHP as a scripting language, a good article to read is >http://www.phpbuilder.com/columns/darrell20000319.php3
>note that the article is aimed at *nix not win32, but most of it still applies
for using fastcgi external server in place of cgi or mod php with php:
to compile fastcgi librairie:
tar xzvf fcgi-2.4.0.tar.gz
to compile the fastcgi apache module:
tar xvzf mod_fastcgi-2.4.2.tar.gz
path/to/apache/bin/apxs -i -A -n fastcgi -o mod_fastcgi.la -c *.c
after you must modify the http.conf to add that:
# load fcgi module
LoadModule fastcgi_module modules/mod_fastcgi.so
# authorization to execute fcgi on tree "/fcgi-bin/"
# define fastcgi external serveur for virtual path "/fcgi-bin/phpfcgi" to execute on targetmachinehost with targetport
FastCgiExternalServer /fcgi-bin/phpfcgi -host targetmachinehostname:targetport
# mime type definietion for some extention
AddType application/x-httpd-fastphp .php .cphp .php4
#define apache cgi regirection with the virtual action script /fcgi-bin/phpfcgi associated with the defined mime type.
Action application/x-httpd-fastphp /fcgi-bin/phpfcgi
compile php with --enable-cgi and --enable-fastcgi=/to/lib/fastcgi
start on target machine php with "php -b ip:port" for ear request from mod_fastcgi.
some aditional thing are in sapi/cgi/README.FastCGI of php src tree.
the document root of the apache machine must be synchronous with the php target machine... with the same tree...
and with that solution you can mixe php5 and php4 with different extention of apache directory limitation to one or another version...
with performance like mod_php!
Thanks nordkyn, this one was very helpful.
Please note that the kernel has to be compiled with misc binary support, which is activated on most distributions like Debian.
You would have to please these two lines in a script to run it after every reboot, on debian I propose /etc/init.d/bootmisc.sh
You could place this lines at the end but before : exit 0
# Install PHP as binary handler
mount -t binfmt_misc none /proc/sys/fs/binfmt_misc
echo ":PHP:E::php::/usr/bin/php4:" > /proc/sys/fs/binfmt_misc/register
And please remember that the package management would override the file on the next distribution upgrade :)