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isset is much faster than array_key_exists. For caches we need to ensure as much performance as possible. To all null to continue to be stored and provide correct results, non ttl also now saves in $this->store[$key][0]. As isset($this->store[$key]) will return true in all cases. time() as found in cache::now() can be slow on some platforms and we shouldn't bother checking it unless needed. It also stops non-ttl caches paying the ttl price. Unit tests were adjusted to ensure null is still handled correctly when we are only using isset. |
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