Composer 安装：nicolabphp-ftp-client 时报错：the requested PHP extension ftp is missing from your system 的解决

1、Composer 安装：nicolab/php-ftp-client 时报错：the requested PHP extension ftp is missing from your system ，如图1

图1

PS E:\wwwroot\channel-pub-api> composer require --prefer-dist nicolab/php-ftp-client
Using version ^1.5 for nicolab/php-ftp-client
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - nicolab/php-ftp-client v1.5.1 requires ext-ftp * -> the requested PHP extension ftp is missing from your system.
    - nicolab/php-ftp-client v1.5.0 requires ext-ftp * -> the requested PHP extension ftp is missing from your system.
    - Installation request for nicolab/php-ftp-client ^1.5 -> satisfiable by nicolab/php-ftp-client[v1.5.0, v1.5.1].

  To enable extensions, verify that they are enabled in your .ini files:
    - C:\php-7.2.14\php.ini
  You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.

Installation failed, reverting ./composer.json to its original content.
PS E:\wwwroot\channel-pub-api> composer require --prefer-dist nicolab/php-ftp-client
Using version ^1.5 for nicolab/php-ftp-client
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Package operations: 1 install, 0 updates, 0 removals
  - Installing nicolab/php-ftp-client (v1.5.1): Downloading (100%)
Writing lock file
Generating autoload files

2、PHP 的 Windows 版本已内建对此扩展的支持。编辑 C:\php-7.2.14\php.ini，启用扩展：FTP

extension=ftp

3、再次安装，安装成功，如图2

图2

Using version ^1.5 for nicolab/php-ftp-client
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Package operations: 1 install, 0 updates, 0 removals
  - Installing nicolab/php-ftp-client (v1.5.1): Downloading (100%)
Writing lock file
Generating autoload files