Note: You should not be using ZVAL_DELREF() in day to day usage. Instead,
you should use zval_ptr_dtor(). Use ZVAL_DELREF() only if you're
messing with the refcount directly and know what you're doing.
Note #2: For clarity, if you want to initialize a new zval with a refcount
of 0, it's best to do that directly, instead of using ZVAL_DELREF
after allocating the zval...
various xml extensions. currently the only implemented support is the
addition of the streams support for libxml. One new function,
libxml_set_streams_context, which allows a streams context to bet set
prior to loading or writing documents. This works transparently with any
extension that uses libxml. All ini settings that effect streams will
also now effect the loading and writing of xml documents.
TODO: linux support, not sure if config.m4 will work right.