You'll need to compile php-leveldb extension and the leveldb library. We don't currently ship these with our prebuilt PHP binaries as the php-leveldb extension is currently unstable. Compiling these on Windows is a pain in the butt, so it's recommended to use Linux or Mac. You can compile your own PHP binary with leveldb by using compile.sh in https://github.com/pmmp/php-build-scripts , with the `-l` flag to include leveldb (it's not included by default).