public function getConstrainedKeys($constraint)
	{
		$this->mediate();

		return array_unique($this->getConstrained($constraint)->fieldsByKey($this->associativeLocal));
	}
public function getConstrainedKeys($constraint)
	{
		$this->mediate();

		return array_unique($this->getConstrained($constraint)->fieldsByKey($this->associativeLocal));
	}
public function getConstrainedKeys ( $ constraint ) { $ this -> mediate ( ) ; return array_unique ( $ this -> getConstrained ( $ constraint ) -> fieldsByKey ( $ this -> associativeLocal ) ) ; }
Get keys based on a given constraint

@param   closure  $constraint  The constraint function to apply
@return  array
@since   2.0.0
Get keys based on a given constraint