As of PHP 8, JIT compilation is available as an experimental feature. To enable JIT compilation in PHP, you would typically include or uncomment certain lines in your php.ini configuration file. Here’s a basic example:
[opcache] zend_extension=opcache.so opcache.enable=1 opcache.enable_cli=1 opcache.jit=tracing opcache.jit_buffer_size=100M
In this example, opcache.jit is set to “tracing,” which means JIT compilation is triggered by tracing hot code paths during execution. The opcache.jit_buffer_size configuration specifies the size of the JIT buffer.
Keep in mind that JIT compilation in PHP is still considered experimental, and its effectiveness can vary depending on the nature of your application. It’s essential to test and monitor the performance to determine if JIT compilation provides significant benefits for your specific use case.
Additionally, there are third-party tools and projects, such as Facebook’s HipHop Virtual Machine (HHVM), that have been developed to compile PHP code into machine code. However, the landscape of PHP compilation tools may change, so it’s a good idea to stay informed about the latest developments in this area.
