# DBM_Filter::null - filter for DBM_Filter - perldoc - [phpMan]

## NAME
    [DBM_Filter::null](https://www.chedong.com/phpMan.php/perldoc/DBMFilter%3A%3Anull/markdown) - filter for DBM_Filter

## SYNOPSIS
        use SDBM_File; # or DB_File, GDBM_File, NDBM_File, or ODBM_File
        use DBM_Filter ;

        $db = tie %hash, ...
        $db->Filter_Push('null');

## DESCRIPTION
    This filter ensures that all data written to the DBM file is null terminated. This is useful
    when you have a perl script that needs to interoperate with a DBM file that a C program also
    uses. A fairly common issue is for the C application to include the terminating null in a string
    when it writes to the DBM file. This filter will ensure that all data written to the DBM file
    can be read by the C application.

## SEE ALSO
    DBM_Filter, perldbmfilter

## AUTHOR
    Paul Marquess <pmqs@cpan.org>