(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.