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Returns if the specified mode outputs blocks or not (PHP 4 >= 4.0.2, PHP 5)
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. (e.g. 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.