Calculate software metrics for PHP projects

I would like to calculate some code metrics for my PHP OOP projects. I try to use some of the tools mentioned in here. But except trail version of Understand, which presents only

number of code, comment, blank lines
number of classes number of file
number of functions number of
declarative/executable statements

I couldn't find any working for PHP.

Plugin for Eclipse by State of Flow is not working with my (not so new) Galileo Eclipse v3.5.

I'm interested in measures such as

depth of inheritance tree,
avg function length,
weighted methods per class,
duplications,
...

Are there any tools?

Solution

PHP Depend generates some nice metrics for you.