无法使用 Composer 在 Windows 上安装 Mailgun 库

Can't install Mailgun library on Windows with composer

我一直在尝试使用 composer 在我的本地主机中安装 mailgun 库。我在命令提示符中写了以下命令：

php composer require mailgun/mailgun-php:~1.3

它给了我错误 Could not open input file: composer

然后我尝试删除上一个命令开头的 php ：

composer require mailgun/mailgun-php:~1.3

它显示：

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./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
- The requested package mailgun/mailgun-php 1.0.0 could not be found.
Problem 2
- guzzle/guzzle v3.7.4 requires ext-curl * -> the requested PHP extension cu
rl is missing from your system.
- guzzle/guzzle v3.7.3 requires ext-curl * -> the requested PHP extension cu
rl is missing from your system.
- guzzle/guzzle v3.7.2 requires ext-curl * -> the requested PHP extension cu
rl is missing from your system.
- guzzle/guzzle v3.7.1 requires ext-curl * -> the requested PHP extension cu
rl is missing from your system.
- guzzle/guzzle v3.7.0 requires ext-curl * -> the requested PHP extension cu
rl is missing from your system.
- Installation request for guzzle/guzzle 3.7.* -> satisfiable by guzzle/guzz
le[v3.7.0, v3.7.1, v3.7.2, v3.7.3, v3.7.4].

Potential causes:
- A typo in the package name
- The package is not available in a stable-enough version according to your min
imum-stability setting
see <https://groups.google.com/d/topic/composer-dev/_g3ASeIFlrc/discussion> f
or more details.

Read <http://getcomposer.org/doc/articles/troubleshooting.md> for further common
problems.

Installation failed, reverting ./composer.json to its original content.

我这几天一直在努力安装mailgun，请帮助我。

更新：

仅供参考：我正在使用 xampp

使用 Windows

composer.phar 文件详细信息：

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{
"name":"mailgun/mailgun-php",
"description":"The Mailgun SDK provides methods for all API functions.",
"require": {
"guzzle/guzzle":"3.7.*"
},
"require-dev": {
"phpunit/phpunit":"3.7.*"
},
"autoload": {
"psr-0": {
"Mailgun\\\\Tests":"tests/",
"Mailgun":"src/"
}
},
"license":"MIT",
"authors": [
{
"name":"Travis Swientek",
"email":"[email protected]"
}
],
"minimum-stability":"stable"
}