(PHP 4 >= 4.0.7, PHP 5, PHP 7 < 7.2.0, PECL mcrypt >= 1.0.0)
mcrypt_generic_deinit — This function deinitializes an encryption module
This function has been DEPRECATED as of PHP 7.1.0. Relying on this function is highly discouraged.
$td
   ) : bool
   This function terminates encryption specified by the encryption
   descriptor (td). It clears all buffers, but does
   not close the module.  You need to call
   mcrypt_module_close() yourself. (But PHP does this for
   you at the end of the script.)
  
tdThe encryption descriptor.
   Returns TRUE on success or FALSE on failure.