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# mcrypt_module_is_block_mode

(PHP 4 >= 4.0.2)

mcrypt_module_is_block_mode -- This function returns if the the specified mode outputs blocks or not

## Description

bool mcrypt_module_is_block_mode ( string mode [, string lib_dir])

This function returns `TRUE` if the mode outputs blocks of bytes or `FALSE` if it outputs just bytes. (eg. `TRUE` for cbc and ecb, and `FALSE` for cfb and stream). The optional `lib_dir` parameter can contain the location where the mode module is on the system.

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mcrypt_module_is_block_algorithm | Up | mcrypt_module_open