nginx showing blank PHP pages

Question

I have setup an nginx server with php5-fpm. When I try to load the site I get a blank page with no errors. Html pages are served fine but not php. I tried turning on disp

Answer 1

I wrote a short C program that returns the environment variables passed from nginx to the fastCGI application.

#include 
#include 
extern char **environ;

int main(int argc, char **argv) {
    char *envvar;
    int i;

    int count = 0;
    while(FCGI_Accept() >= 0) {
        printf("Content-type: text/html\n\n"
               "\n"
               "
FastCGI Call Debugging Tool
\n"
               "
Request number %d running on host %s
\n"
               "
Environment Variables
\n",
              ++count, getenv("SERVER_NAME"));
        i = 0;
        envvar = environ[i];
        while (envvar != NULL) {
                printf("%s
",envvar);
                envvar = environ[++i];
        }
        printf("
\n");
    }
    return 0;
}

Save this to a file, e.g. fcgi_debug.c

To compile it, first install gcc and libfcgi-dev, then run:

gcc -o fcgi_debug fcgi_debug.c -lfcgi

To run it, install spawn-fcgi, then run:

spawn-fcgi -p 3000 -f /path/to/fcgi_debug

Then, change your nginx fcgi config to point to the debug program:

fastcgi_pass  127.0.0.1:3000;

Restart nginx, refresh the page, and you should see all the parameters appear in your browser for you to debug! :-)