Herman Venter
a9fa4568fe
The proximal purpose of this differential is to fix the debugger client so that it does not write raw strings to the console (with control characters doing their thing to the console and unprintable characters pretending not to exist). This change in behavior means that the serializer used to convert values to strings can no longer be instantiated with the PrintR option, as it has been in a subset of cases. (The reason being that print_r() must not change its behavior.) Rather than introduce yet another serializer option, I decided to always make the debugger client serialize user visible values using the existing DebuggerDump option, which is already used in a number of such cases and which has no other use. To make the overall change less painful for users, I preferred to change behavior of DebuggerDump to be more like PrintR in a number of cases, primarily the formatting of objects (where the current behavior is to make a JSON like string). This does not impact the behavior of the debugger client API or the behavior of FBIDE, since these do their own thing directly with the DebuggerSerialization format and never see the result of the DebuggerDump format.
HipHop VM for PHP 
HipHop VM (HHVM) is a new open-source virtual machine designed for executing programs written in PHP. HHVM uses a just-in-time compilation approach to achieve superior performance while maintaining the flexibility that PHP developers are accustomed to. HipHop VM (and before it HPHPc) has realized > 5x increase in throughput for Facebook compared with Zend PHP 5.2.
HipHop is most commonly run as a standalone server, replacing both Apache and modphp.
Installing
You can install a prebuilt package or compile from source.
Running
You can run standalone programs just by passing them to hhvm: hhvm my_script.php.
HipHop bundles in a webserver. So if you want to run on port 80 in the current directory:
sudo hhvm -m server
For anything more complicated, you'll want to make a config.hdf and run sudo hhvm -m server -c config.hdf.
Contributing
We'd love to have your help in making HipHop better. If you run into problems, please open an issue, or better yet, fork us and send a pull request. Join us on #hhvm on freenode.
If you want to help but don't know where to start, try fixing some of the Zend tests that don't pass. You can run them with hphp/test/run. When they work, move them to zend/good and send a pull request.
Before changes can be accepted a Contributors Licensing Agreement (pdf - print, sign, scan, link) must be signed.
Licence
HipHop VM is licensed under the PHP and Zend licenses except as otherwise noted.