src/Writer.php
public static function open( $fileName ) {
		return Reader::haveExtension() ?
			new Writer\DBA( $fileName ) :
			new Writer\PHP( $fileName );
	}
public static function open( $fileName ) {
		return Reader::haveExtension() ?
			new Writer\DBA( $fileName ) :
			new Writer\PHP( $fileName );
	}
Open a writer and return a subclass instance.
The user must have write access to the directory, for temporary file creation.

@param string $fileName
@return Writer