mcrypt_enc_is_block_algorithm Checks whether the algorithm of the opened mode is a block algorithm &warn.deprecated.function-7-1-0; &reftitle.description; boolmcrypt_enc_is_block_algorithm resourcetd Tells whether the algorithm of the opened mode is a block algorithm. &reftitle.parameters; td The encryption descriptor. &reftitle.returnvalues; Returns &true; if the algorithm is a block algorithm or &false; if it is a stream one.