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Calculating password length with DBM

<?php $data_file = '/tmp/users.db'; $total_length = 0; if (! ($dbh = dba_open($data_file,'r','gdbm'))) {     die("Can't open database $data_file"); } $k = dba_firstkey($dbh); while ($k) {     $total_length += strlen(dba_fetch($k,$dbh));     $k = dba_nextkey($dbh); } print "Total length of all passwords is $total_length characters."; dba_close($dbh); ?>