Description
resource 
openssl_pkey_get_public ( mixed certificate )
     Returns a positive key resource identifier on success, or FALSE on error.
    
     openssl_get_publickey() extracts the
     public key from certificate and
     prepares it for use by other functions.
     certificate can be one of the following:
     
- an X.509 certificate resource 
- a string having the format
        file://path/to/file.pem. The named file must
        contain a PEM encoded certificate/private key (it may contain both).
        
- A PEM formatted private key.