Returns an x509 certificate resource on success, FALSE on failure.

A string containing the content of a certificate, PEM encoded

do not verify the signers certificate of a signed message.

Can the certificate be used for the client side of an SSL connection?

Can the certificate be used for the server side of an SSL connection?

Returns TRUE if the certificate can be used for the intended purpose, FALSE if it cannot, or 1 on error.

If the cainfo is specified, it should hold information about the trusted CA certificates to use in the verification process see certificate verification for more information about this parameter.

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.

Additionally, if you are planning to use the key generation and certificate signing functions, you will need to install a valid openssl.cnf on your system. As of PHP 4.3.0, we include a sample configuration file in the openssl of our win32 binary distribution. If you are using PHP 4.2.0 or later and are missing the file, you can obtain it from the OpenSSL home page or by downloading the PHP 4.3.0 release and using the configuration file from there.