Fix static analysis warning

The condition is already checked at the start of the function, mark this
code properly as unreachable.

Fix GH-16594: Assertion failure in DOM -> before

The invalid parent condition can actually happen because PHP's DOM is
allows to get children of e.g. attributes; something normally not

Fix GH-16594: Assertion failure in DOM -> before

The invalid parent condition can actually happen because PHP's DOM is
allows to get children of e.g. attributes; something normally not
possible.

Closes GH-16597.

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Merge branch 'PHP-8.3' into PHP-8.4

* PHP-8.3:
Fix GH-16039: Segmentation fault (access null pointer) in ext/dom/parentnode/tree.c

Throw instead of silently failing when creating a too long text node

Lower branches suffer from this as well but we cannot change the
behaviour there.
We also add NULL checks to chec

Throw instead of silently failing when creating a too long text node

Lower branches suffer from this as well but we cannot change the
behaviour there.
We also add NULL checks to check for allocation failure.

Closes GH-15014.

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Remove bogus tree setting code from parentnode/tree.c (#15044)

I don't know why this code was here in the first place, it is present
since the initial implementation. It doesn't make sen

Remove bogus tree setting code from parentnode/tree.c (#15044)

I don't know why this code was here in the first place, it is present
since the initial implementation. It doesn't make sense because:
1. It would require updating the refcounts if the document wasn't
actually already set.
2. We enforce that the document is the same as the target document by
this point, so setting the tree is pointless.

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Move stricterror fetch to dom_child_removal_preconditions() body

Remove impossible condition

The parent's child must exist because otherwise this node could not have
a parent node.

Deduplicate NULL checks in ext/dom (#15015)

This introduces a new helper php_dom_create_nullable_object() that does
the NULL check and puts NULL in return_value. Otherwise it runs
ph

Deduplicate NULL checks in ext/dom (#15015)

This introduces a new helper php_dom_create_nullable_object() that does
the NULL check and puts NULL in return_value. Otherwise it runs
php_dom_create_object(). This deduplicates a bit of code.

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Implement CSS selectors