add path info to slow log

[fabiosal]

Hi,
I was looking to add to slow logs information about request url. This is useful in case the web server is modifying the url as described here #18536

The sapi_request_info structure already foresee a request_uri variable,
but it is going to ends up containing the "SCRIPT FILENAME" after static void init_request_info(void) is executed

php-src/sapi/fpm/fpm/fpm_main.c

Line 1334 in 4cc5f02

SG(request_info).request_uri = env_script_name;

so I added the path_info variable to the sapi_request_info, in order to put in it the value of the PATH_INFO parameter setted by the web server.

Then in the slow log the request_method, request_path_info and request_query_string are added

[05-Dec-2025 14:20:01]  [pool www] pid 167
script_filename = /var/www/public/index.php
request_method = GET
request_path_info = /lucky/number/4
request_query_string = ciao=hello
[0x00007ffff6215070] sleep() /var/www/public/index.php:3

In order to work properly the web server should add the PATH_INFO to the request to fpm

ie for nginx

    location / {
        # try to serve file directly, fallback to index.php
        try_files $uri /index.php$uri$is_args$args;
    }
    
    ....
     location ~ ^/index\.php(/|$) {
            fastcgi_split_path_info ^(.+\.php)(/.*)$;
            fastcgi_param PATH_INFO $fastcgi_path_info;
            ...
     }
    ..

Thanks