(PHP 4 >= 4.0.6, PHP 5)
openssl_private_decrypt — Decrypts data with private key
$data
   , string &$decrypted
   , mixed $key
   [, int $padding = OPENSSL_PKCS1_PADDING
  ] )
   openssl_private_decrypt() decrypts
   data that was previous encrypted via
   openssl_public_encrypt() and stores the result into
   decrypted. 
  
You can use this function e.g. to decrypt data which were supposed only to you.
data
decrypted
key
       key must be the private key corresponding that
       was used to encrypt the data.  
      
padding
       padding can be one of
       OPENSSL_PKCS1_PADDING,
       OPENSSL_SSLV23_PADDING,
       OPENSSL_PKCS1_OAEP_PADDING,
       OPENSSL_NO_PADDING.
      
   Returns TRUE on success or FALSE on failure.