(PHP 5 >= 5.2.0)
openssl_csr_get_subject — Returns the subject of a CERT
本函数还未编写文档，仅有参数列表。
mikko koivu (2010-07-21 09:10:09)
this function does not yet return SANs (subject alternative names) fields for UC certificates like those used in exchange 2007.
stephan[at]strato-rz[dot]de (2009-01-21 01:13:53)
The returning assoziative array is indexed with the fields
in the subject so you should have a array key named CN,OU and so on.