Analyse all your OSM Changesets if the objects have changed
The script changeset-analyzer.php will try to create a subdirectory called changeset-analyzer-$USERNAME, where $USERNAME is either posted by a HTML form with a parameter called display or as the first argument when it is called from the command-line.
To allow for this, the user running the script must be allowed to create directories. For Linux the files and the directory should be chown'd to the same user and group and thus the standard chmod of 755 should be enough to make the script work.