• A PHP extension that improves performance by storing precompiled script bytecode in shared memory, eliminating the need to parse and compile PHP scripts on every execution. When a PHP script runs for the first time, OPcache compiles it into opcode (machine-readable bytecode) and caches it in memory; subsequent requests retrieve the cached opcode directly, significantly reducing CPU usage, memory consumption, and page load times. OPcache was originally developed by Zend.

1. Related terms: Operation code, Hypertext Preprocessor
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