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mcrypt_module_is_block_algorithm

This function checks whether the specified algorithm is a block algorithm (PHP 4 >= 4.0.2, PHP 5)
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.