HHVM
HHVM is an open-source virtual machine designed for executing programs written in Hack and PHP. It is developed by Facebook and aims to achieve improved performance compared to the standard PHP interpreter.
HHVM: Open-Source Virtual Machine
HHVM is an open-source virtual machine designed for executing programs written in Hack and PHP, developed by Facebook with the goal of improving performance compared to standard PHP interpreter.
What is HHVM?
HHVM (HipHop Virtual Machine) is an open-source virtual machine developed by Facebook to execute programs written in Hack and PHP. Some key points about HHVM:
- It was created to improve the performance of Facebook's PHP codebase and infrastructure.
- HHVM uses a just-in-time (JIT) compilation approach to achieve better performance compared to the standard PHP interpreter.
- It supports the full PHP language specification along with Hack - an alternative PHP-derived programming language also created by Facebook.
- In benchmarks, HHVM has demonstrated multiple times faster performance than the standard PHP 5 interpreter for typical web workloads.
- HHVM also provides capabilities like asynchronous programming and type checking that are not available in standard PHP.
- It has received widespread adoption and is used by many large-scale websites including Wikipedia, WordPress.com, and Facebook itself.
In summary, HHVM is an advanced PHP runtime that enables faster website performance along with additional development capabilities. Its combination of high performance and full PHP/Hack support has made it popular for large, high-traffic web applications.
HHVM Features
Features
- Just-in-time compilation for improved performance
- Supports Hack and PHP programming languages
- Built-in debugging and profiling tools
- Compatible with most PHP frameworks and applications
- Supports asynchronous programming models
Pricing
- Open Source
Pros
Faster execution than standard PHP
Lower memory usage
More consistent performance
Better type safety with Hack language
Easy integration with existing PHP code
Cons
Limited compatibility with some PHP extensions
Fewer supported platforms than standard PHP
Requires code changes to enable async features
Steeper learning curve than standard PHP
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