Answer
Opcache caches precompiled PHP bytecode in shared memory, eliminating the need to recompile scripts on each request. It reduces CPU usage and improves response time.
Quick Answer
Opcache compiles PHP scripts to bytecode and caches them in shared memory. Subsequent requests skip parsing and compilation, reducing CPU and I/O significantly. Benefits: 2-10x speed improvement, lower CPU usage, reduced latency. Tune opcache.memory_consumption (128-256MB), opcache.max_accelerated_files, and opcache.validate_timestamps (disable in production for max speed).
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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