PHP Developer Builds LRU Cache Hitting 13M+ Ops/Sec for High-Load Identity Maps

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A PHP developer has engineered a high-performance LRU cache implementation in PHP 8.5, achieving over 13 million operations per second — roughly three to six times faster than typical implementations. The cache was built to serve as the foundation of an Identity Map within a custom persistence layer on top of Eloquent, where slow cache performance would negate the query-saving benefits of the pattern. The developer went through 10 iterative benchmarked versions, discovering that choices like using arrays instead of objects and splitting classes strategically had significant throughput impacts. Key interface methods include touch, touchMany, evict, remove, and clear, designed for efficient O(1) key lookup with doubly linked list ordering. The results were recorded on a low-powered laptop running Docker, and production performance has not yet been measured.

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