mcrypt_generic_deinit This function deinitializes an encryption module boolmcrypt_generic_deinit resourcetd 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.