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# mcrypt_module_is_block_algorithm

(PHP 4 >= 4.0.2)

mcrypt_module_is_block_algorithm -- This function checks whether the specified algorithm is a block algorithm

## Description

bool mcrypt_module_is_block_algorithm ( string algorithm [, string lib_dir])

This function returns `TRUE` if the specified algorithm is a block algorithm, or `FALSE` is it is a stream algorithm. The optional `lib_dir` parameter can contain the location where the algorithm module is on the system.

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