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Does php retain frequently accessed files in memory when the file is included (include(), include_once(), require(), require_once()) or is it flushed at the end of execution? I'm not talking about including the same file twice during a single execution. I'm saying page executes, file x is included, execution completes -- is file x pulled raw from the file system again on the next execution or is it pulled from memory/cache? If so is there a performance difference?