Description:
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From manual page: http://www.php.net/function.mcrypt-get-key-size
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The doc description lists:

int mcrypt_get_key_size ( string $cipher , string $module )

But I think module should really be mode.  As suggested by the explanation:

"mcrypt_get_key_size() is used to get the size of a key of the specified cipher (in combination with an encryption mode)."
                                   ^^^^

And also by the example:

echo mcrypt_get_key_size('tripledes', 'ecb');

Thanks!