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mcrypt_enc_is_block_algorithm_mode

Checks whether the encryption of the opened mode works on blocks (PHP 4 >= 4.0.2, PHP 5)
bool mcrypt_enc_is_block_algorithm_mode ( resource td )

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).