Explain advanced OPcache and JIT optimization strategies in PHP 8.

OPcache and JIT improve PHP performance by caching compiled opcodes and dynamically compiling hot code paths into machine code.

PHP historically compiled scripts during every request. OPcache fundamentally changed PHP scalability by storing compiled opcodes in shared memory.

Without OPcache:

With OPcache:

This eliminates repeated compilation overhead.

Key OPcache internals:

Stores:

Duplicate strings are stored only once globally.

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