<?php // Create a new Db4 Instance $db = new Db4(); // Open it outside a Db4Env environment with datafile/var/lib/db4 // and database name "test" $db->open(null, "/var/tmp/db4", "test"); // Get the current value of "counter" $counter = $db->get("counter"); print "Counter Value is $counter\n"; // Increment $counter and put() it. $db->put("counter", $counter+1); // Sync to be certain, since we're leaving the handle open $db->sync(); ?>