1 PHP in version 5.5 comes with a caching engine built-in – OpCache – which stores precompiled script bytecode in the memory.
2 OpCache is only a bytecode caching engine so it won’t offer a similar functionality.
3 OpCache, however, is bundled with PHP 5.5 so it will definitely work with this PHP version.
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@puls0804: Understanding OpCache http://t.co/CpWj8rK5Dv @sitepointdotcom 님이 씀