Laravel 错误：您的要求无法解析为一组可安装的软件包.

我正在使用laravel 5.3进行我的项目.现在我正在把它安装到服务器上.

The problem occured when doing so.And i am stuck at this point of error.

当我跑的时候

composer安装--无开发人员

出现以下命令错误:

 Problem 1
    - Installation request for fgrosse/phpasn1 1.5.2 -> satisfiable by fgrosse/phpasn1[1.5.2].
    - fgrosse/phpasn1 1.5.2 requires ext-gmp * -> the requested PHP extension gmp is missing from your system.
  Problem 2
    - Installation request for mdanter/ecc v0.4.2 -> satisfiable by mdanter/ecc[v0.4.2].
    - mdanter/ecc v0.4.2 requires ext-gmp * -> the requested PHP extension gmp is missing from your system.
  Problem 3
    - Installation request for pusher/pusher-php-server 2.6.3 -> satisfiable by pusher/pusher-php-server[2.6.3].
    - pusher/pusher-php-server 2.6.3 requires ext-curl * -> the requested PHP extension curl is missing from your system.
  Problem 4
    - pusher/pusher-php-server 2.6.3 requires ext-curl * -> the requested PHP extension curl is missing from your system.
    - laravel-notification-channels/pusher-push-notifications 1.0.2 requires pusher/pusher-php-server 2.6.* -> satisfiable by pusher/pusher-php-server[2.6.3].
    - Installation request for laravel-notification-channels/pusher-push-notifications 1.0.2 -> satisfiable by laravel-notification-channels/pusher-push-notifications[1.0.2].

  To enable extensions, verify that they are enabled in your .ini files:
    - /etc/php/7.0/cli/php.ini
    - /etc/php/7.0/cli/conf.d/10-mysqlnd.ini
    - /etc/php/7.0/cli/conf.d/10-opcache.ini
    - /etc/php/7.0/cli/conf.d/10-pdo.ini
    - /etc/php/7.0/cli/conf.d/20-calendar.ini
    - /etc/php/7.0/cli/conf.d/20-ctype.ini
    - /etc/php/7.0/cli/conf.d/20-exif.ini
    - /etc/php/7.0/cli/conf.d/20-fileinfo.ini
    - /etc/php/7.0/cli/conf.d/20-ftp.ini
    - /etc/php/7.0/cli/conf.d/20-gettext.ini
    - /etc/php/7.0/cli/conf.d/20-iconv.ini
    - /etc/php/7.0/cli/conf.d/20-json.ini
    - /etc/php/7.0/cli/conf.d/20-mbstring.ini
    - /etc/php/7.0/cli/conf.d/20-mysqli.ini
    - /etc/php/7.0/cli/conf.d/20-pdo_mysql.ini
    - /etc/php/7.0/cli/conf.d/20-phar.ini
    - /etc/php/7.0/cli/conf.d/20-posix.ini
    - /etc/php/7.0/cli/conf.d/20-readline.ini
    - /etc/php/7.0/cli/conf.d/20-shmop.ini
    - /etc/php/7.0/cli/conf.d/20-sockets.ini
    - /etc/php/7.0/cli/conf.d/20-sysvmsg.ini
    - /etc/php/7.0/cli/conf.d/20-sysvsem.ini
    - /etc/php/7.0/cli/conf.d/20-sysvshm.ini
    - /etc/php/7.0/cli/conf.d/20-tokenizer.ini
  You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.

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