PHP Tips and Tricks

Zend Debugger
Zend Core comes complete with the option to enable remote PHP debugging and profiling of Web applications.
Source: http://files.zend.com/help/Zend-Core/studio_server.htm
Zend Server
sudo vim /etc/apt/sources.list
add “deb http://repos.zend.com/zend-server/deb server non-free”
wget http://repos.zend.com/zend.key -O- |apt-key add -
aptitude update
aptitude install zend-server-php-5.3
Source: http://files.zend.com/help/Zend-Server/zend-server.htm#deb_installation.htm

After upgrade Magento to 1.4.0.1 I’ve got such an error.
The problem is that Varien did not managed to add removal deprecated code/files which overrides Zend’s code.
In order to fix this problem you have to remove folder:
app/code/core/Zend/Cache