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Hello,
I have created an RFC to add the function openssl_get_channel_binding: https://wiki.php.net/rfc/openssl_get_channel_binding
PR: https://github.com/php/php-src/pull/24035
The function exposes data related the an established TLS connection, making it possible for applications to build on top of the security provided by TLS. It is needed for SASL mechanisms such as SCRAM-SHA-256-PLUS.
Regards,
Sjoerd Langkemper