mcrypt_module_is_block_algorithm_mode Returns if the specified module is a block algorithm or not &warn.deprecated.function-7-1-0; &reftitle.description; boolmcrypt_module_is_block_algorithm_mode stringmode stringlib_dir 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). &reftitle.parameters; mode The mode to check. lib_dir The optional lib_dir parameter can contain the location where the algorithm module is on the system. &reftitle.returnvalues; 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).