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+APCu is userland caching: APC stripped of opcode caching in
+preparation for the deployment of Zend Optimizer+ as the
+primary solution to opcode caching in future versions of PHP.
+
+APCu only supports userland caching (and dumping) of variables,
+providing an upgrade path for the future. When O+ takes over,
+many will be tempted to use 3rd party solutions to userland
+caching, possibly even distributed solutions; this would be a
+grave error. The tried and tested APC codebase provides far
+superior support for local storage of PHP variables.