Yii2 How to get the value of a parameter in a configuration file

I want to put the AppID of the public number in a custom parameter in a configuration file, and then it can be adjusted on any controller, and it will be modified if it is called.

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I want to put the AppID of the public number in a custom parameter in a configuration file, and then it can be adjusted on any controller, and it will be modified if it is called.

config/param.php

Yii: $app->params[' key '] key for your parameter key name

First put the parameters in the Config directory in the params.php file, as follows:

return [    'key' => 'value',];

Then, at the time of reference, use:

\Yii::$app->params['key']

Note that it is the params, not the Param.

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