laravel读取不到env值问题的分析

今天开始使用laradock，但是项目一运行，就显示数据库连接不上。

Illuminate\Database\QueryException  : SQLSTATE[HY000] [2002] Connection refused (SQL:

这不应该啊。尝试手动连接数据库，没有问题。那么就看看连接信息把。

array:15 [
  "driver" => "mysql"
  "host" => "127.0.0.1"
  "port" => "3306"
  "database" => "ss"
  "username" => "homestead"
  "password" => "secret"
  "unix_socket" => ""
  "charset" => "utf8mb4"
  "collation" => "utf8mb4_unicode_ci"
  "prefix" => "table_"
  "prefix_indexes" => true
  "strict" => true
  "engine" => null
  "options" => []
  "name" => "mysql"
]

果然，连接信息还是旧的呢。那么为什么会是如此呢？明明env文件已经更新了。读取出来内容已经变更了。

env文件读取是在kernel.php完成的

if (! $this->app->hasBeenBootstrapped()) {
    $this->app->bootstrapWith($this->bootstrappers());
}

依次要执行如下初始化操作

protected $bootstrappers = [
    \Illuminate\Foundation\Bootstrap\LoadEnvironmentVariables::class,
    \Illuminate\Foundation\Bootstrap\LoadConfiguration::class,
    \Illuminate\Foundation\Bootstrap\HandleExceptions::class,
    \Illuminate\Foundation\Bootstrap\RegisterFacades::class,
    \Illuminate\Foundation\Bootstrap\SetRequestForConsole::class,
    \Illuminate\Foundation\Bootstrap\RegisterProviders::class,
    \Illuminate\Foundation\Bootstrap\BootProviders::class,
];

而关键在于 LoadEnvironmentVariables这个class

我们可以看到，再bootstrap的时候他首先有一个判断

if ($app->configurationIsCached()) {
    return;
}

那么，问题的答案就很明显了。。。

php artisan config:clear
Configuration cache cleared!

收工