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# mcrypt_module_is_block_algorithm_mode

(PHP 4 >= 4.0.2, PHP 5)

mcrypt_module_is_block_algorithm_mode -- returns if 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 `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.

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