What does the laravel config() method do?

In laravel, the function of the config() method is to obtain the data defined in the config configuration directory, the syntax is "config('key')"; the key value can be spliced through the "." syntax, which contains the required The file name to be accessed and the option name, such as "config('app.url')".

The operating environment of this tutorial: Windows 7 system, Laravel version 5, Dell G3 computer.

Laravel's config directory generally stores configuration information, such as app.php, auth.php, mail.php, view.php, etc.

config directory structure

The default directory structure is:

Specified data can be obtained through the config('key') method.

The setting value can be read through "dot" syntax, which contains the file name to be accessed and the option name.

Now I want to read the url of the\config\app.phpfile. The data in the file is:

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

How to get it:

config('app.url')

If you find If app.url is not reached, the second parameter will be returned by default.

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

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