PHP8 OpenSSL目的检查 flag
X509_PURPOSE_SSL_CLIENT (int)X509_PURPOSE_SSL_SERVER (int)X509_PURPOSE_NS_SSL_SERVER (int)X509_PURPOSE_SMIME_SIGN (int)X509_PURPOSE_SMIME_ENCRYPT (int)X509_PURPOSE_CRL_SIGN (int)X509_PURPOSE_ANY (int)
X509_PURPOSE_SSL_CLIENT (int)X509_PURPOSE_SSL_SERVER (int)X509_PURPOSE_NS_SSL_SERVER (int)X509_PURPOSE_SMIME_SIGN (int)X509_PURPOSE_SMIME_ENCRYPT (int)X509_PURPOSE_CRL_SIGN (int)X509_PURPOSE_ANY (int)