protected function _findInArray( array $aData, $mKey, $sDefault = '' )
    {
        $sVal = $sDefault;

        if ( array_key_exists( $mKey, $aData ) and is_scalar( $aData[$mKey] ) ) {
            $sVal = trim( (string) $aData[$mKey] );
        }

        return $sVal;
    }