Answer
Opcode preloading loads classes and functions into Opcache on server startup to eliminate cold starts.
Quick Answer
Opcode preloading (PHP 7.4+) loads PHP files into shared memory at server start. Scripts are compiled once and shared across all PHP-FPM workers with zero per-request overhead. Configure via opcache.preload pointing to a preload script. opcache.preload_user sets the owner. Best for frameworks: preload all core framework files. Can improve performance 5-20% but requires restart to reload.
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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