Php is works fine..
But "nginx" my error.log is this;
2017/02/23 09:33:24 [error] 776#0: *5 FastCGI sent in stderr: "PHP message: PHP Fatal error: Call to undefined function curl_init() in /var/www/html/electrum.php on line 39" while reading response header from upstream, client: 192.168.2.203, server: your_server_ip, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock:", host: "192.168.2.158"
I'm working on raspberry pi and connect with ssh... Please helpp

Seems like
sudo apt-get install php5-curl
might do the trick

(at least, it might solve this issue... There is no guarantee that everything else will work, but you'll have to tackle one problem at a time)
(sollution = untested, i don't have a rPi running nginx, so i cannot test out the sollution)
don't forget to either restart nginx/php-fpm, or just to plain restart your box just to be sure...