Backport 4fe82131: Backport libxml2 2.13.2 fixes (#14816)

Backproted from https://github.com/php/php-src/pull/14789

Backport 0a39890c: Fix libxml2 2.12 build due to API breaks

See https://github.com/php/php-src/actions/runs/7062192818/job/19225478601

Support templated content

The template element in HTML 5 is special in the sense that it does not
add its contents into the DOM tree, but instead keeps them in a separate
shadow DOM

Support templated content

The template element in HTML 5 is special in the sense that it does not
add its contents into the DOM tree, but instead keeps them in a separate
shadow DOM document fragment. Interacting with the DOM tree cannot touch
the elements in the document fragment.

Closes GH-14906.

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Replace `@deprecated` by `#[\Deprecated]` for internal functions / class constants (#14750)

Co-authored-by: Gina Peter Banyard <girgias@php.net>
Co-authored-by: Niels Dossche <7771979+ni

Replace `@deprecated` by `#[\Deprecated]` for internal functions / class constants (#14750)

Co-authored-by: Gina Peter Banyard <girgias@php.net>
Co-authored-by: Niels Dossche <7771979+nielsdos@users.noreply.github.com>

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Stop relying on the deprecated xmlLastError global

Fix compilation on libxml2 2.13

Implement Dom\TokenList (#13664)

Part of RFC: https://wiki.php.net/rfc/dom_additions_84

Closes GH-11688.

Implement Dom $innerHTML property

Implement CSS selectors

Fix GH-14698: segfault on dom node after dereference.

close GH-14701

Clean-up unused headers (#14365)

* ext/mbstring.c: clean-up headers and include intrinsics

Throw early when a non-stream-context resource is passed to libxml_set_streams_context() (#14279)

Avoid code duplication for error instance creation in ext/libxml (#14277)

Optimize and reduce memory usage of XML serialization (#14204)

The serialization process uses the system allocator and requires a copy
to request allocated memory once finished. This pat

Optimize and reduce memory usage of XML serialization (#14204)

The serialization process uses the system allocator and requires a copy
to request allocated memory once finished. This patch improves this by
using smart_str to build the resulting string, reducing the number of
copies and reducing total peak memory usage.

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Handle dumping node to file

Handle dumping document to file

Factor out all common code for XML serialization and merge common paths

Move dom_attr_value() into ext/libxml

Simplify property check in php_libxml_node_free_resource()

Cleanup php_libxml_internal_error_handler_ex()

Remove bogus entity reference cleanup code

Cleanup php_libxml_streams_IO_open_wrapper()

Cleanup php_libxml_unregister_node()

Implement request #71571: XSLT processor should provide option to change maxDepth (#13731)

There are two depth limiting parameters for XSLT templates.
1) maxTemplateDepth
This cor

Implement request #71571: XSLT processor should provide option to change maxDepth (#13731)

There are two depth limiting parameters for XSLT templates.
1) maxTemplateDepth
This corresponds to the recursion depth of a template. For very
complicated templates this can be hit.
2) maxTemplateVars
This is the total number of live variables. When using recursive
templates with lots of parameters you can hit this limit.

This patch introduces two new properties to XSLTProcessor that
corresponds to the above variables.

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Only register error handling when observable

Closes GH-13702.