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This extension is to show low level PHP structures. It is therefore very sensitive to changes in the PHP API. If the PECL install doesn't work, please try the latest version from GitHub:

git clone
cd vld
make && make install

If it still doesn't compile, then VLD is not for you. Patches are welcome through Pull Requests.

How does it work?

There are a few options in the form of php.ini settings available.

In order for VLD to do anything, you need to set

If you want to prevent VLD from executing code, set vld.execute=0.

Other settings are also available, but not documented yet.

Please see the project page at for some more information.