<?php $td = mcrypt_module_open (MCRYPT_CAST_256, '', MCRYPT_MODE_CFB, ''); echo mcrypt_enc_get_modes_name($td). "\n"; $td = mcrypt_module_open ('cast-256', '', 'ecb', ''); echo mcrypt_enc_get_modes_name($td). "\n";?>
Prints:
CFB ECB