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# mcrypt_module_is_block_algorithm_mode

(PHP 4 >= 4.0.2)

mcrypt_module_is_block_algorithm_mode -- This function returns if the the specified module is a block algorithm or not

## Description

``bool mcrypt_module_is_block_algorithm_mode` (string mode [, string lib_dir])`

This 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.

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