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# mcrypt_cfb

(PHP 3 >= 3.0.8, PHP 4, PHP 5)

mcrypt_cfb -- Encrypt/decrypt data in CFB mode

## Description

string mcrypt_cfb ( int cipher, string key, string data, int mode, string iv )
string mcrypt_cfb ( string cipher, string key, string data, int mode [, string iv] )

The first prototype is when linked against libmcrypt 2.2.x, the second when linked against libmcrypt 2.4.x or higher. The `mode` should be either `MCRYPT_ENCRYPT` or `MCRYPT_DECRYPT`.

This function should not be used anymore, see mcrypt_generic() and mdecrypt_generic() for replacements.

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