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Nikita Popov
7566742754
openssl_pkey_new() fetches various options from the config file -- most of these are optional, and not specifying them is not an error condition from the perspective of the user. Unfortunately, the CONF_get_string() API pushes an error when accessing a key that doesn't exist (_CONF_get_string does not, but that is presumably a private API). This commit adds a helper php_openssl_conf_get_string() that automatically clears the error in this case. I've found that OpenSSL occasionally does the same thing internally: https://github.com/openssl/openssl/blob/22040fb790c854cefb04bed98ed38ea6357daf83/apps/req.c#L515-L517 Closes GH-6699.