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>mcrypt_enc_get_iv_size</H1
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>    (PHP 4 &#62;= 4.0.2)</P
>mcrypt_enc_get_iv_size&nbsp;--&nbsp;Returns the size of the IV of the opened algorithm</DIV
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>int <B
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>&#13;     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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