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* PHP-8.4: Fix GH-20906: Assertion failure when messing up output buffers
* PHP-8.5: Fix GH-20906: Assertion failure when messing up output buffers
Newer PCRE2 rejects \K in lookarounds at compile time, so the negative-length match code path can no longer be triggered from userland PHP. The PCRE2_EXTRA_ALLOW_LOOKAROUND_BSK flag that would re-enable it is only settable via the C compile context API.
* PHP-8.5: ext/pcre: drop negative-length match tests
Mirror the mdata_used protection pattern from php_pcre_replace_func_impl in php_pcre_match_impl, php_pcre_replace_impl, php_pcre_split_impl, and php_pcre_grep_impl. close GH-21291
* PHP-8.4: ext/pcre: fix mdata_used race conditions in PCRE functions
* PHP-8.5: ext/pcre: fix mdata_used race conditions in PCRE functions
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