[pull] master from php:master#910
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pull[bot] merged 5 commits intoturkdevops:masterfrom May 4, 2026
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set_client_option_2d() built the temporary key string with the connection's persistent flag but always released it with persistent=1. On a duplicate-key update of the connect_attr hash, zend_hash_update() does not retain the passed key, so the caller-owned non-persistent string was freed via free() instead of efree(), tripping the IS_STR_PERSISTENT assertion in debug builds and mismatching allocators in release. Reachable by retrying mysqli_real_connect() on a handle whose first connect failed, since mysqlnd re-adds _client_name and _server_host on every connect attempt. close GH-21931
* PHP-8.4: ext/mysqlnd: Fix persistent free of non-persistent connect_attr key.
* PHP-8.5: ext/mysqlnd: Fix persistent free of non-persistent connect_attr key.
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