Answer
JIT compiles specific code paths to machine code. It benefits CPU-heavy operations such as math, image processing, and loops. Web applications benefit minimally due to I/O-bound workloads.
Quick Answer
PHP JIT (Just-In-Time compiler, added in PHP 8.0) compiles bytecode to native machine code at runtime. Most beneficial for CPU-intensive code (math, algorithms, game loops). Minimal benefit for typical web apps which are I/O-bound. Enable with opcache.jit_buffer_size and opcache.jit=tracing. JIT works on top of Opcache. Benchmark your specific workload - gains vary widely.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ