When using Gii to generate code in Yii, I encounter 'Setting unknown property: yiiwebApplication::gii'

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When using Gii to generate code in Yii, I encountered "Setting unknown property: yiiwebApplication::gii"

For the use of Gii: http://www.yiichina.com/doc/guide/2.0/ start-gii and https://github.com/yiisoft/yii2/blob/master/docs/guide/start-gii.md, I put the following paragraph directly in $config = [. . . 】; inside, and then encountered "Setting unknown property: yiiwebApplication::gii".

<span>'gii' => [
    'class' => 'yii\gii\Module',
    'allowedIPs' => ['127.0.0.1', '::1', '192.168.0.*', '192.168.178.20'] // adjust this to your needs
],</span>

Then I tried to put this code in "

$config['modules']['gii' ] = [
'class'=>

<span>$config['modules']['gii'] = [
        'class' => 'yii\gii\Module',
    	'allowedIPs' => ['127.0.0.1', '::1', '192.168.0.*', '10.231.113.187']
    ];</span>

So this document is still ambiguous.
The above introduces the "Setting unknown property: yiiwebApplication::gii" encountered when using Gii to generate code in Yii, including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.