命令：composer require simplesoftwareio/simple-qrcode 1.3.* ，
完整的错误提示：./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
- 2amigos/yii2-qrcode-helper 1.0.0 requires yiisoft/yii2 * -> satisfiable by
yiisoft/yii2[2.0.0, 2.0.1, 2.0.10, 2.0.11, 2.0.11.1, 2.0.11.2, 2.0.12, 2.0.12.1
, 2.0.12.2, 2.0.13, 2.0.13.1, 2.0.13.2, 2.0.13.3, 2.0.14, 2.0.14.1, 2.0.14.2, 2.
0.15, 2.0.15.1, 2.0.2, 2.0.3, 2.0.4, 2.0.5, 2.0.6, 2.0.7, 2.0.8, 2.0.9].
- 2amigos/yii2-qrcode-helper 1.0.1 requires yiisoft/yii2 * -> satisfiable by
yiisoft/yii2[2.0.0, 2.0.1, 2.0.10, 2.0.11, 2.0.11.1, 2.0.11.2, 2.0.12, 2.0.12.1
, 2.0.12.2, 2.0.13, 2.0.13.1, 2.0.13.2, 2.0.13.3, 2.0.14, 2.0.14.1, 2.0.14.2, 2.
0.15, 2.0.15.1, 2.0.2, 2.0.3, 2.0.4, 2.0.5, 2.0.6, 2.0.7, 2.0.8, 2.0.9].
- 2amigos/yii2-qrcode-helper 1.0.2 requires yiisoft/yii2 * -> satisfiable by
yiisoft/yii2[2.0.0, 2.0.1, 2.0.10, 2.0.11, 2.0.11.1, 2.0.11.2, 2.0.12, 2.0.12.1
, 2.0.12.2, 2.0.13, 2.0.13.1, 2.0.13.2, 2.0.13.3, 2.0.14, 2.0.14.1, 2.0.14.2, 2.
0.15, 2.0.15.1, 2.0.2, 2.0.3, 2.0.4, 2.0.5, 2.0.6, 2.0.7, 2.0.8, 2.0.9].
- 2amigos/yii2-qrcode-helper 1.0.3 requires yiisoft/yii2 * -> satisfiable by
yiisoft/yii2[2.0.0, 2.0.1, 2.0.10, 2.0.11, 2.0.11.1, 2.0.11.2, 2.0.12, 2.0.12.1
, 2.0.12.2, 2.0.13, 2.0.13.1, 2.0.13.2, 2.0.13.3, 2.0.14, 2.0.14.1, 2.0.14.2, 2.
0.15, 2.0.15.1, 2.0.2, 2.0.3, 2.0.4, 2.0.5, 2.0.6, 2.0.7, 2.0.8, 2.0.9].
- yiisoft/yii2 2.0.9 requires bower-asset/jquery 2.2.*@stable | 2.1.*@stable
| 1.11.*@stable | 1.12.*@stable -> no matching package found.
- yiisoft/yii2 2.0.8 requires bower-asset/jquery 2.2.*@stable | 2.1.*@stable
| 1.11.*@stable -> no matching package found.
- yiisoft/yii2 2.0.7 requires bower-asset/jquery 2.2.*@stable | 2.1.*@stable
| 1.11.*@stable -> no matching package found.
- yiisoft/yii2 2.0.6 requires bower-asset/jquery 2.1.*@stable | 1.11.*@stabl
e -> no matching package found.
- yiisoft/yii2 2.0.5 requires bower-asset/jquery 2.1.*@stable | 1.11.*@stabl
e -> no matching package found.
- yiisoft/yii2 2.0.4 requires bower-asset/jquery 2.1.*@stable | 1.11.*@stabl
e -> no matching package found.
- yiisoft/yii2 2.0.3 requires bower-asset/jquery 2.1.*@stable | 1.11.*@stabl
e -> no matching package found.
- yiisoft/yii2 2.0.2 requires bower-asset/jquery 2.1.*@stable | 1.11.*@stabl
e -> no matching package found.
- yiisoft/yii2 2.0.15.1 requires bower-asset/jquery 3.2.*@stable | 3.1.*@sta
ble | 2.2.*@stable | 2.1.*@stable | 1.11.*@stable | 1.12.*@stable -> no matching
package found.
- yiisoft/yii2 2.0.15 requires bower-asset/jquery 3.2.*@stable | 3.1.*@stabl
e | 2.2.*@stable | 2.1.*@stable | 1.11.*@stable | 1.12.*@stable -> no matching p
ackage found.
- yiisoft/yii2 2.0.14.2 requires bower-asset/jquery 3.2.*@stable | 3.1.*@sta
ble | 2.2.*@stable | 2.1.*@stable | 1.11.*@stable | 1.12.*@stable -> no matching
package found.
- yiisoft/yii2 2.0.14.1 requires bower-asset/jquery 3.2.*@stable | 3.1.*@sta
ble | 2.2.*@stable | 2.1.*@stable | 1.11.*@stable | 1.12.*@stable -> no matching
package found.
- yiisoft/yii2 2.0.14 requires bower-asset/jquery 3.2.*@stable | 3.1.*@stabl
e | 2.2.*@stable | 2.1.*@stable | 1.11.*@stable | 1.12.*@stable -> no matching p
ackage found.
- yiisoft/yii2 2.0.13.3 requires bower-asset/jquery 3.2.*@stable | 3.1.*@sta
ble | 2.2.*@stable | 2.1.*@stable | 1.11.*@stable | 1.12.*@stable -> no matching
package found.
- yiisoft/yii2 2.0.13.2 requires bower-asset/jquery 3.2.*@stable | 3.1.*@sta
ble | 2.2.*@stable | 2.1.*@stable | 1.11.*@stable | 1.12.*@stable -> no matching
package found.
- yiisoft/yii2 2.0.13.1 requires bower-asset/jquery 3.2.*@stable | 3.1.*@sta
ble | 2.2.*@stable | 2.1.*@stable | 1.11.*@stable | 1.12.*@stable -> no matching
package found.
- yiisoft/yii2 2.0.13 requires bower-asset/jquery 3.2.*@stable | 3.1.*@stabl
e | 2.2.*@stable | 2.1.*@stable | 1.11.*@stable | 1.12.*@stable -> no matching p
ackage found.
- yiisoft/yii2 2.0.12.2 requires bower-asset/jquery 2.2.*@stable | 2.1.*@sta
ble | 1.11.*@stable | 1.12.*@stable -> no matching package found.
- yiisoft/yii2 2.0.12.1 requires bower-asset/jquery 2.2.*@stable | 2.1.*@sta
ble | 1.11.*@stable | 1.12.*@stable -> no matching package found.
- yiisoft/yii2 2.0.12 requires bower-asset/jquery 2.2.*@stable | 2.1.*@stabl
e | 1.11.*@stable | 1.12.*@stable -> no matching package found.
- yiisoft/yii2 2.0.11.2 requires bower-asset/jquery 2.2.*@stable | 2.1.*@sta
ble | 1.11.*@stable | 1.12.*@stable -> no matching package found.
- yiisoft/yii2 2.0.11.1 requires bower-asset/jquery 2.2.*@stable | 2.1.*@sta
ble | 1.11.*@stable | 1.12.*@stable -> no matching package found.
- yiisoft/yii2 2.0.11 requires bower-asset/jquery 2.2.*@stable | 2.1.*@stabl
e | 1.11.*@stable | 1.12.*@stable -> no matching package found.
- yiisoft/yii2 2.0.10 requires bower-asset/jquery 2.2.*@stable | 2.1.*@stabl
e | 1.11.*@stable | 1.12.*@stable -> no matching package found.
- yiisoft/yii2 2.0.1 requires bower-asset/jquery 2.1.*@stable | 1.11.*@stabl
e -> no matching package found.
- yiisoft/yii2 2.0.0 requires bower-asset/jquery 2.1.*@stable | 1.11.*@stabl
e -> no matching package found.
- Installation request for 2amigos/yii2-qrcode-helper ~1.0 -> satisfiable by
2amigos/yii2-qrcode-helper[1.0.0, 1.0.1, 1.0.2, 1.0.3].
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://getcomposer.org/doc/04-schema.md#minimum-stability> for more det
ails.
- It's a private package and you forgot to add a custom repository to find it
Read <https://getcomposer.org/doc/articles/troubleshooting.md> for further commo
n problems.
Installation failed, reverting ./composer.json to its original content.
提示我的PHP 版本太高，不符合composer.json需要的版本，但是在PHP 下应该也是可以运行的，不管怎么说，试着走起，composer可以设置忽略版本匹配，命令是：
composer install --ignore-platform-reqs
发现还是不行，下一个修改版本：
说是缺少 fxp/composer-asset-plugin插件：好，小姐姐就安装插件，命令是：
>composer global require "fxp/composer-asset-plugin
:^1.4.1"
在此又会发现一个新的问题：
Head to https://github.com/settings/tokens/new?scopes=repo&description=Composer+
on+KINGYEE234+2018-05-03+1336
to retrieve a token. It will be stored in "C:/Users/zhangfengxia/AppData/Roaming
/Composer/auth.json" for future use by Composer.
Token (hidden):
好，继续战斗吧，那就生成token，这里说的GitHub的授权秘钥
进入 https://github.com/settings/tokens 点击 「Generate new token」 新建一个 Token，选择默认新建就行，然后就会得到一个 Token，然后输入这个值就 OK 了。
点击后到新的页面之后，直接点击按钮，
这个时候你就看到token啦
好，这时候把token输入进命令行后，在此输入命令，
OK，大工告成！！！！