Usage of config in laravel

Laravel Of config Generally store configuration information , Can pass config('key') Method to get the specified data .

The setting value can be set through 「 spot 」 Syntactic reading , It contains the file name to access and the option name .

Now I want to read \config\app.PHP Of documents url, The data in the file is :

'url' => 'http://localhost',

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Access method :

config('app.url')

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If you can't find it app.url, The second parameter will be returned by default .

config('app.url', 'default_val')

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