If you followed my tutorial pages about installing Apache + PHP + missing extensions and installing PEAR previously, maybe you are interested to look at this fix.
Installing MySQL is easy. Just go to MySQL Download page and grab the x86_64 DMG file.
Follow the installation instructions and do not forget to also install StartupItem.
As soon as you attempt to connect to MySQL, this error would popup for you:
Warning: mysql_connect() [function.mysql-connect]: [2002] No such file or directory (trying to connect via unix:///var/mysql/mysql.sock) in ...
To fix that, the only necessary change is actually to create a symbolic link to the same location PHP is looking at (I would recommend to update php.ini config to point to the right file).
$ sudo mkdir /var/mysql $ sudo ln -s /tmp/mysql.sock /var/mysql/mysql.sock
Restart your Apache and live happy!

Hi, Guilherme.
First of all I want to thank you for your Bisna ZendFramework+Doctrine integration library. Some time ago I’ve struggled with the same issue with ZendServer storing mysql socket in it’s own directory and did just the same as you suggest #ln -s …
But the problem was that I needed to do this each time I reboot (wich was getting a bit annoying), so a better approach may be to configure mysql to store the socket where it needs to be. This can be done in my.cnf with :
[mysqld]
socket= /tmp/mysql.sock #(or whatever)
Hope that was to the point of your post.
Dmitry.