Not needed anymore.

This function is deprecated, and doesn't even exist anymore as of 4.0.5.

This function is only for saving memory. A finalized page takes less memory but cannot be modified anymore.

Original stream was not seekable and has been released. newstream is set to the new seekable stream. You should not access origstream anymore.

The number of references that exist for this variable. For every new reference to the value stored in this variable, this counter is increased by 1. For every lost reference, this counter is decreased by 1. When the reference counter reaches 0, no references exist to this value anymore, which causes automatic freeing of the value.

Zend now keeps track of all references to this resource. As soon as all references to the resource are lost, the destructor that you previously registered for this resource is called. The nice thing about this setup is that you don't have to worry about memory leakages introduced by allocations in your module just register all memory allocations that your calling script will refer to as resources. As soon as the script decides it doesn't need them anymore, Zend will find out and tell you.