Why is the php-fpm code not executing?

Question

PHP

Hello.

The site works on a bundle: nginx + php-fpm.
There is a third-party converter on the site that opens from a separate page, but it does not work.
The code executes a post request to a php script:

$.post('convertor.php', {get_sites_arr: 1},
    function (responce){
...});

Where the following line should be executed:

if (isset($_POST['get_sites_arr']))
{
...
}

But the code is not executed and in the response I just get the source code of the convertor.php file.
The nginx config has the following:

server {
        listen 80;
        root /var/www/cy/;
        index index.php;
        server_name имя_сайта
        location ~ \.php$ {
                try_files $uri =404;
                fastcgi_pass unix:/var/run/php5-fpm.sock;
                fastcgi_index index.php;
                fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
                include fastcgi_params;
        }
}

The converter itself is located in: site_folder/convert/

Answer 1

It's not entirely clear where you have convertor.php , maybe you need
$.post('/convert/i.html/convertor.php', ...