gd-png: fatal libpng error: zlib error

When upgrading php from php4 to php5, the following error occurs;

gd-png: fatal libpng error: zlib error

I've found the solution - so I thought i'd post it here to help others.

In php5, the quality range changes for imagePNG from 0-99 to 0-9. therefore you need to change your code to relect this, e.g.

imagePNG('','', 9);

(instead of imagePNG('','',90)) - I divided the quality value by 10 and then round or floor the value accordingly.

Change Password in Linux

The password for linux can be changes using the passwd command. Here are a few basic examples of how to change the password from the command line;

passwd Change your own password.
passwd ftpuser Change ftpusers' password.
passwd -d ftpuser Delete ftpusers' password.

Short but sweet - i'd thought i'd add this as I always forget things like this!