   #PHP Manual Mcrypt Encryption Functions mcrypt_enc_get_block_size
   mcrypt_enc_get_key_size

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                            mcrypt_enc_get_iv_size

   (PHP 4 >= 4.0.2)
   mcrypt_enc_get_iv_size -- Returns the size of the IV of the opened
   algorithm

Description

   int mcrypt_enc_get_iv_size ( resource td)

   This function returns the size of the iv of the algorithm specified by
   the encryption descriptor in bytes. If it returns '0' then the IV is
   ignored in the algorithm. An IV is used in cbc, cfb and ofb modes, and
   in some algorithms in stream mode.
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