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= Cache Design =
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== Cache Data Copying ==
=== Shallow Copying ===

=== Deep Copying ===

== Copying Source Or Destination ==
|| ||Pointer Mem Cache||Offset Mem Cache||Disk Cache||PHP Scripting Engine
||use pointer||yes||no||no||yes
||use offset||no||yes||yes||no
||block or object||block||block||block||object


As we copy data between php and cache, either src (source) or dest (destination) can be block or object.

 object storage::
  allocate for each elements that to be stored
 block storage::
  calc the total size of elements of data, allocate whole block 1 in go. but each elements is stored as if it allocate storage from the block.