(PHP 4 = 4.0.6)
Returns TRUE if the
certificate can be used for the intended purpose, FALSE if it cannot, or -1 on
error.
openssl_x509_checkpurpose()
examines the certificate specified by
x509cert to see if it can be used for the purpose
specified by purpose.
cainfo should be an
array of trusted CA files/dirs as described in Certificate
Verification.
untrustedfile, if
specified, is the name of a PEM encoded file holding
certificates that can be used to help verify the certificate,
although no trust in placed in the certificates that come
from that file.
表格 1.
openssl_x509_checkpurpose() purposes
注: This function was added in 4.0.6.