(PHP 4 >= 4.0.6, PHP 5)
openssl_x509_checkpurpose — Verifies if a certificate can be used for a particular purpose
$cainfo= array() [, string
openssl_x509_checkpurpose() examines a certificate to see if it can be used for the specified
The examined certificate.
|X509_PURPOSE_SSL_CLIENT||Can the certificate be used for the client side of an SSL connection?|
|X509_PURPOSE_SSL_SERVER||Can the certificate be used for the server side of an SSL connection?|
|X509_PURPOSE_NS_SSL_SERVER||Can the cert be used for Netscape SSL server?|
|X509_PURPOSE_SMIME_SIGN||Can the cert be used to sign S/MIME email?|
|X509_PURPOSE_SMIME_ENCRYPT||Can the cert be used to encrypt S/MIME email?|
|X509_PURPOSE_CRL_SIGN||Can the cert be used to sign a certificate revocation list (CRL)?|
|X509_PURPOSE_ANY||Can the cert be used for Any/All purposes?|
cainfo should be an array of trusted CA files/dirs as described in Certificate Verification.
If specified, this should be the name of a PEM encoded file holding certificates that can be used to help verify the certificate, although no trust is placed in the certificates that come from that file.
TRUE if the certificate can be used for the intended purpose,
FALSE if it cannot, or -1 on error.