Php/docs/openssl.purpose-check
来自菜鸟教程
目的检查标志
X509_PURPOSE_SSL_CLIENT(integer)X509_PURPOSE_SSL_SERVER(integer)X509_PURPOSE_NS_SSL_SERVER(integer)X509_PURPOSE_SMIME_SIGN(integer)X509_PURPOSE_SMIME_ENCRYPT(integer)X509_PURPOSE_CRL_SIGN(integer)X509_PURPOSE_ANY(integer)