(PHP 4 >= 4.0.2, PHP 5)
mcrypt_module_is_block_algorithm_mode — Returns if the specified module is a block algorithm or not
This function returns TRUE if the mode is for use with block algorithms, otherwise it returns FALSE. (e.g. FALSE for stream, and TRUE for cbc, cfb, ofb). The optional lib_dir parameter can contain the location where the mode module is on the system.