common value name for all pages

I have to use a value $myvalue for 90% of pages at my site.

50% pages has same value (10% of page actually I don't need this value
but since this value is set to layout I have to do something to avoid
showing error ) so I want to set $this->set('myvalue', default) as
default value
but I don't want to set in every controller since there are may.

Is there any way I can set this value at app_controller.php,
so I don't need to set value to $myvalue at every my controller??
or is there other way to do it?

thanks

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