laravel 项目artisan原理简介

介绍

Artisan 是 Laravel 自带的命令行接口，他提供了许多使用的命令来帮助你构建 Laravel 应用

artisan 文件

#!/usr/bin/env php
<?php

use Symfony\Component\Console\Input\ArgvInput;
use Symfony\Component\Console\Output\ConsoleOutput;

/*
|--------------------------------------------------------------------------
| Create The Application
|--------------------------------------------------------------------------
|
| First we need to get an application instance. This creates an instance
| of the application / container and bootstraps the application so it
| is ready to receive HTTP / Console requests from the environment.
|
*/

$app = require __DIR__.'/bootstrap/app.php';

/*
|--------------------------------------------------------------------------
| Run The Artisan Application
|--------------------------------------------------------------------------
|
| When we run the console application, the current CLI command will be
| executed in this console and the response sent back to a terminal
| or another output device for the developers. Here goes nothing!
|
*/

$kernel = $app->make(
    'Illuminate\Contracts\Console\Kernel'
);

exit($kernel->handle(new ArgvInput, new ConsoleOutput));

首先我们创建了一个app实例（容器），然后创建 'Illuminate\Contracts\Console\Kernel’实例调用handle方法，关闭

分析

在实际开发中我们一般自定义Kernel继承’Illuminate\Contracts\Console\Kernel’来绑定到容器中，一般是在app/Console/Kernerl.php

<?php

namespace App\Console;

use Illuminate\Console\Scheduling\Schedule;
use Laravel\Lumen\Console\Kernel as ConsoleKernel;

class Kernel extends ConsoleKernel
{
    /**
     * The Artisan commands provided by your application.
     *
     * @var array
     */
    protected $commands = [
    ];

    /**
     * Define the application's command schedule.
     *
     * @param  \Illuminate\Console\Scheduling\Schedule  $schedule
     * @return void
     */
    protected function schedule(Schedule $schedule)
    {

    }

}

handle 方法

    /**
     * Run the console application.
     *
     * @param  \Symfony\Component\Console\Input\InputInterface  $input
     * @param  \Symfony\Component\Console\Output\OutputInterface  $output
     * @return int
     */
    public function handle($input, $output = null)
    {
        try {
            $this->app->boot();

            return $this->getArtisan()->run($input, $output);
        } catch (Exception $e) {
            $this->reportException($e);

            $this->renderException($output, $e);

            return 1;
        } catch (Throwable $e) {
            $e = new FatalThrowableError($e);

            $this->reportException($e);

            $this->renderException($output, $e);

            return 1;
        }
    }

$this->app 指的artisan 文件中创建的application类，这里先进行 $this->app->boot()，是为了防止数据提供者没有进行注册；

$this->getArtisan();

use Illuminate\Console\Application as Artisan;

    /**
     * Get the Artisan application instance.
     *
     * @return \Illuminate\Console\Application
     */
    protected function getArtisan()
    {
        if (is_null($this->artisan)) {
            return $this->artisan = (new Artisan($this->app, $this->app->make('events'), $this->app->version()))
                                ->resolveCommands($this->getCommands());
        }

        return $this->artisan;
    }

    /**
     * Resolve an array of commands through the application.
     *
     * @param  array|mixed  $commands
     * @return $this
     */
    public function resolveCommands($commands)
    {
        $commands = is_array($commands) ? $commands : func_get_args();

        foreach ($commands as $command) {
            $this->resolve($command);
        }

        return $this;
    }

这里创建了Console\Application 实例，并且将 Kernel 中的$this->getCommands() 加入到 Console\Application $commands属性中。

Kernel 中的$this->getCommands() 就是我们在 App\Console\Kernel $commands 中
自定义类 + 定时任务执行类 如下

    /**
     * Get the commands to add to the application.
     *
     * @return array
     */
    protected function getCommands()
    {
        return array_merge($this->commands, [
            'Illuminate\Console\Scheduling\ScheduleRunCommand',
        ]);
    }

$this->getArtisan()->run($input, $output)； run方法就是执行我们对应artisan 后续命令,简单来说就是根据$input 获取 命令名称，找到对应$comands里面的命令类，然后执行命令类中的handle方法，最后按照格式赋予$output属性进行输出