Brent 10/29/2020

PHP 8: How to setup the JIT

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This technical article provides a detailed, step-by-step guide on enabling and configuring the Just-In-Time (JIT) compiler introduced in PHP 8. It covers enabling opcache, setting the JIT buffer size, verifying the JIT is active, and explains the complex, single-number configuration system (opcache.jit) that controls optimization levels and triggering modes.

PHP 8: How to setup the JIT

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