It appears you are using an incompatible version of eZ for your version of PHP. Most likely that you are using a version of ez of 3.6.x or less with a PHP 4.4 installation.
eZ 3.6 branch requires PHP 4.3, and 3.7.x and higher use PHP 4.4.
Here you can get versions of eZ that are compatible with PHP 4.4. I would recommend the latest version of the 3.8 branch if you are installing new, and 3.7.9 if you want an easier upgrade for a 3.6 installation.