How install memcached on Ubuntu 18.4 for PHP 7.3.1

Now i need install package memcached for PHP 7.3 on Ubuntu 18.4 I have server nginx, Yii2 framework and server block, but it is not work.
How can i do this ?

server {
    listen 80;
    server_name dev.advanced.ru;
    set $base_root /www/dev.advanced.ru;
    root $base_root;

    error_log /var/log/nginx/advanced.local.error.log warn;
    access_log /var/log/nginx/advanced.local.access.log main;
    charset UTF-8;
    index index.php index.html;

   location / {
    root $base_root/frontend/web;

    set $memcached_key "$uri?$args";
    memcached_pass 127.0.0.1:11211;
    error_page     404 502 504 = @fallback;

    try_files $uri $uri/ /frontend/web/index.php$is_args$args;

     location ~ ^/assets/.+\.php(/|$) {
        deny all;
        }
   }
   location /admin {
      alias $base_root/backend/web/;

   location = /admin {
      try_files $uri /backend/web/index.php$is_args$args;
     }
     try_files $uri $uri/ /backend/web/index.php$is_args$args;

     location ~ ^/admin/assets/.+\.php(/|$) {
        deny all;
     }
   }


  location ~ ^/.+\.php(/|$) {
  rewrite (?!^/((frontend|backend)/web|admin))^ /frontend/web$uri break;
  rewrite (?!^/backend/web)^/admin(/.+)$ /backend/web$1 break;

  fastcgi_pass 127.0.0.1:9000; # proxy requests to a TCP socket
  #fastcgi_pass unix:/var/run/php-fpm.sock; 
  fastcgi_split_path_info ^(.+\.php)(.*)$;
  include /etc/nginx/fastcgi_params;
  fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        try_files $fastcgi_script_name =404;
    }

    location ~ /\. {
        deny all;
    }

  location @fallback {
      proxy_pass     http://admin;
  }
}