(PHP 4 >= 4.0.7, PHP 5)
mcrypt_generic_deinit — This function deinitializes an encryption module
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.) Returns FALSE on error, or TRUE on success.
See for an example mcrypt_module_open() and the entry on mcrypt_generic_init().