Add the ability to set the variable`s default value with generateActionParams()

[radiocity]

Now \yii\gii\Generator->generateActionParams() generates string like

echo $generator->generateActionParams(); 
// "$lorem, $ipsum"

Add the ability to set the variable`s default value. Something like

echo $generator->generateActionParams(['lorem'=>false, 'ipsum' => 10]); 
// "$lorem = false, $ipsum = 10"

[lichunqiang]

Can you point out the usage?

I just find it used when generate actionView