在日常的开发过程中，我们有时候会突发奇想，尝试封装自己的插件。通过本文的阅读相信你在20分钟内就能掌握这种技巧，当然速度快慢取决于你的网络状况。截图比较麻烦我就直接堆代码了。另外，本文参考了 https://github.com/BroQiang/laravel-image

一、创建一个composer项目

生成 composer.json

# 创建一个二级目录

> mkdir nomandia/iimage

> cd nomandia/iimage

> composer init

Welcome to the Composer config generator

This command will guide you through creating your composer.json config.

Package name (/) [nomandia/iimage]: nomandia/iimage

Description []: Simple picture upload toolkit.

Author ['rootme' , n to skip]: nomandia

Minimum Stability []: 0.1 # 注意这里是默认的版本，会影响到composer的下载

Invalid minimum stability "0.1". Must be empty or one of: stable, RC, beta, alpha, dev

Minimum Stability []: library # 不填就是library

Package Type (e.g. library, project, metapackage, composer-plugin) []: library

License []: MIT

Define your dependencies.

Would you like to define your dependencies (require) interactively [yes]? yes

# 这里定义一些依赖，根据自身情况调整。也可以跳过，然后修改composer.json

Search for a package: php

Enter the version constraint to require (or leave blank to use the latest version): ~7.1.0

Search for a package: laravel/framework

Enter the version constraint to require (or leave blank to use the latest version): ~5.5

Search for a package: inervention/image

# 拼写错误时也有提示

Found 8 packages matching inervention/image

[0] intervention/image

[1] intervention/imagecache

[2] poznet/image

[3] ostashevdv/yii2-image

[4] finwe/phpstan-intervention-image

[5] flexnst/laravel-image

[6] spiral/intervention-image

[7] hpkns/picturesque

Enter package # to add, or the complete package name if it is not listed: 0

Enter the version constraint to require (or leave blank to use the latest version): ~2.4

Search for a package: qiniu/php-sdk

Enter the version constraint to require (or leave blank to use the latest version): ~7.2

Search for a package:

Would you like to define your dev dependencies (require-dev) interactively [yes]?

Search for a package:

{

"name": "nomandia/iimage",

"description": "Simple picture upload toolkit.",

"type": "library",

"require": {

"php": "~7.1.0",

"laravel/framework": "~5.5",

"intervention/image": "~2.4",

"qiniu/php-sdk": "~7.2"

},

"license": "MIT",

"authors": [

{

"name": "nomandia",

"email": "nomandia@qq.com"

}

],

"minimum-stability": "dev"

}

Do you confirm generation [yes]? yes

文件创建完毕可以执行：composer install 来安装依赖。

添加.gitignore

composer.phar

/vendor/

# Commit your application's lock file https://getcomposer.org/doc/01-basic-usage.md#commit-your-composer-lock-file-to-version-control

# You may choose to ignore a library lock file http://getcomposer.org/doc/02-libraries.md#lock-file

# composer.lock

如果你直接在github上创建repository话会提示你创建 .gitignore

二、创建目录及文件

按照以下结构创建(这里本着最简单的实现原则)

> tree

> /home/nomandia/iimage

> ├───.gitignore

> ├───config

> ├──────iimage.php

> ├───src

> ├──────IImage.php

> ├──────IImageProvider.php

> ├───vendor # 执行composer install后生成，目前没有

> ├───composer.json

> ├───LICENSE

> ├───README.md

修改composer.json

{

"name": "nomandia/iimage",

"description": "Simple picture upload toolkit.",

"require": {

"php": "^7.1.0",

"laravel/framework": "~5.5",

"intervention/image": "~2.4",

"qiniu/php-sdk": "~7.2"

},

"require-dev": {

"php": "^7.1.0",

"laravel/framework": "~5.5",

"intervention/image": "~2.4",

"qiniu/php-sdk": "~7.2"

},

"license": "MIT",

"authors": [

{

"name": "nomandia",

"email": "nomandia@qq.com"

}

],

"autoload": {

"psr-4": {

"Nomandia\\IImage\\": "src/"

}

},

"extra": {

"laravel": {

"providers": [

"Nomandia\\IImage\\IImageProvider"

]

}

}

}

接下来安装依赖，稍等片刻

composer install

三、调整文件

目前涉及到了3个文件：config/iimage.php、src/IImage.php、src/IImageProvider.php，根据作用类型分为：

自定义的配置文件

// file: config/iimage.php

return [

'tmpPath'=>'/tmp'

];

实现体，具体业务类

// file: src/IImage.php

namespace Nomandia\IImage;

class IImage

{

protected $config = [];

public function __construct()

{

$this->initConfig();

}

public function initConfig()

{

$configs = config('iimage', []);

}

public function surpriseMe($name){

echo $name, ", u're awesome."

}

}

服务提供者，用于全局注册后调用

// file: src/IImageProvider.php

namespace Nomandia\IImage;

use Illuminate\Support\ServiceProvider;

class IImageProvider extends ServiceProvider

{

public function boot()

{

// 复制自定义的文件到config目录

if (!file_exists(config_path('iimage.php'))) {

$this->publishes([

dirname(__DIR__) . '/config/iimage.php' => config_path('iimage.php'),

], 'config');

}

}

public function register()

{

$this->mergeConfigFrom(

dirname(__DIR__) . '/config/iimage.php', 'iimage'

);

}

}

上传项目到 github

项目开发完毕后就传到github，这步很关键。

> git commit -m "im nb"

> git push origin master # or git push

四、发布插件到 packagist

测试下

> composer require nomandia/iimage

[InvalidArgumentException]

Could not find package nomandia/iimage at any version for your minimum-stability (dev). Check the package spelling or your minimum-stability

require [--dev] [--prefer-source] [--prefer-dist] [--no-progress] [--no-suggest] [--no-update] [--no-scripts] [--update-no-dev] [--update-with-dependencies] [--ignore-platform-reqs] [--prefer-stable] [--prefer-lowest] [--sort-packages] [-o|--optimize-autoloader

] [-a|--classmap-authoritative] [--apcu-autoloader] [--] []...

这里出现了版本的错误，原因是你的项目并未提供一个默认的版本号导致。你可以在 https://packagist.org/packages/nomandia/iimage 这个页面看到项目的版本信息。要纠正这个错误我们只要增加一个版本号即可

> composer require nomandia/iimage dev-master

./composer.json has been updated

Loading composer repositories with package information

Updating dependencies (including require-dev)

Package operations: 2 installs, 0 updates, 0 removals

- Installing qiniu/php-sdk (v7.2.6): Loading from cache

- Installing nomandia/iimage (dev-master 6a0aa40): Cloning 6a0aa40754 from cache

Writing lock file

Generating optimized autoload files

> Illuminate\Foundation\ComposerScripts::postAutoloadDump

> @php artisan package:discover

Discovered Package: fideloper/proxy

Discovered Package: laravel/tinker

Discovered Package: nunomaduro/collision

Discovered Package: intervention/image

Discovered Package: nomandia/iimage

Package manifest generated successfully.

如此这般便能在你的项目中使用自己的插件了，看！有木有成就感~！

// 你可以这样式的用

namespace App\Http\Controllers;

use Nomandia\IImage\IImage as Image;

class TestController extends Controller

{

function index(){

$v = new Image();

$v->surpriseMe('Nomandia');

}

}

有时候使用git提交时候会报SSL的错误，如：

> git push

git Unknown SSL protocol error in connection to github.com:443

# 这里强制关闭SSL安全链接

git config --global http.sslVerify false

# 另外切换账号也记录下

git config --global user.name nomandia

git config --global user.email nomandia@qq.com

五、项目更新自动发布到 packagist.org

到github.com/USERNAME/PROJECT，打开Settings选项页；

左侧菜单中选择 Integrations & services；

增加一个名为：Packagist 的 Service；

输入packagist 配置，如：账号、token、packagist地址，勾选Active项，然后提交表单即可。

六、常见问题

更新异常时，尝试使用dev版本 composer require nomandia/iimage:dev-master，注意如果你不在github上发布release版本的话，那么dev-master将是默认版本。另外，不推荐指定你项目composer.json中最低接受的版本minimum-stability选项，这样的话其默认值是dev，可在一定程度上避免这种问题。