sub check {
$statement = 'SELECT * FROM users';
$dbh = DBI->connect("DBI:mysql:$DBNAME:localhost","user","pass");
$sth = $dbh->prepare($statement);
$sth->execute();
while(my $ref = $sth->fetchrow_hashref()) {
    $address= $ref->{'add'};
$phone= $ref->{'phone'};
             $password= $ref->{'pass'};
       }
}
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require "config.pl";
check();

print "$name";
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Your config.pl should be made into a module and $name needs to be exported from config so that it is available in the calling script.
For more information see perlman:lib:Exporter, perlman:perlmodlib and perlman:perlmod.

So you will need to add code like


   package ModuleName;
   require Exporter;
   @ISA = qw(Exporter);

   @EXPORT = qw(...);            # symbols to export by default
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@EXPORT should contain the name of the variables and the subroutines you want to be able to access from calling scripts.
Also, your calling script should do a use ModuleName; rather than require ModuleName;

is that really the only way to do it? no way to make variables global or anything ?