MFH: nuke php3 legacy

Missing }}}

MFH: only need context set once

MFH: insure stream usage

MFH: add additional constants
remove un-needed ifdefs

MFH: Fix URI escaping

- Bumber up year

- WS

- create LIBXML_VERSION and LIBXML_DOTTED_VERSION constants

add function to allow extensions to use new error handling if set by user

initial cut of new error handling

add NONET flag to disable network access when loading xml

Fixed bug #31361 (simplexml/domxml segfault when adding node twice)

define options that can be used when loading documents

Fixed bug #29211 (SoapClient doesn't request wsdl through proxy). (Rob)

implement php_libxml_xmlCheckUTF8
- workaround for pre libxml2-2.6.13 function

Fixed bug #29945 (simplexml_load_file URL limitation 255 char)

export php_libxml_error_handler for win32 build

use php_error_docref for libxml2 errors

MFB: Fixed bug #29221 (Segfault using DOM ownerDocument in a PHP object)

fix leak when using relaxng
interim fix for isolating our streams handling
- once libxml supports overriding streams this should be changed
for security reasons

move libxml error handler ro rinit/rshutdown to keep it local to php

Fix bug #27436 dom_import_simplexml innaccurate
extensions register callbacks to export nodes
prevents segfault passing invalid objects to import functions

Use zval_ptr_dtor() to free variables as soon as they hit refcount of 0.

Note: You should not be using ZVAL_DELREF() in day to day usage. Instead,
you should use zval_ptr_dtor()

Use zval_ptr_dtor() to free variables as soon as they hit refcount of 0.

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...

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Fix memory corruption with libxml's error handling.