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4.x is outdated, please check the latest version 22.x
pecl install openswoole-22.0.0
<?php Swoole\Coroutine\Client->getPeerCert(): string|false
When successful, it returns
X509 certificate information, when it fails it returns
Obtain server-side certificate information.
This method can only be used once SSL has been completed and the handshake is successful.
openssl_x509_parse which is provided by the OpenSSL library can be used to parse the certificate information.
You must have installed Swoole using
--enable-openssl for this to work.