(PHP 4 >= 4.2.0, PHP 5)
openssl_pkey_get_private — Get a private key
   openssl_get_privatekey() parses
   key and prepares it for use by other functions.
  
key
       key can be one of the following:
       
passphrase
       The optional parameter passphrase must be used
       if the specified key is encrypted (protected by a passphrase).
      
   Returns a positive key resource identifier on success, or FALSE on error.