nginx config for phpldapadmin in subdir of main-page. ssl-conf were made in the main part. php5handler goes on the php5-fpm socket. works also for phpmyadmin.

phpldapadmin.conf

location /phpldapadmin {
  root /usr/share/;
  index index.php index.html index.htm;
  location ~ ^/phpldapadmin/(.+\.php)$ {
    try_files $uri =404;
    root /usr/share/;
    fastcgi_pass php5handler;
    fastcgi_index index.php;
    fastcgi_param HTTPS on;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    include fastcgi_params;
  }
  auth_basic "phpldapadmin - Admin Bereich"
  auth_basic_user_file /etc/nginx/.htpasswd_admin
}