(PHP 4 >= 4.0.2)
mcrypt_module_is_block_algorithm_mode -- This function returns if the the specified module is a block algorithm or notThis function returns TRUE if the mode is for use with block algorithms, otherwise it returns 0. (eg. 0 for stream, and 1 for cbc, cfb, ofb). The optional lib_dir parameter can contain the location where the mode module is on the system.