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このドキュメントでは、 php中国語ネットマニュアル リリース
(PHP 5 >= PHP 5.3.3)
openssl_cipher_iv_length — Gets the cipher iv length
$method
)Gets the cipher initialization vector (iv) length.
method
The cipher method, see openssl_get_cipher_methods() for a list of potential values.
Returns the cipher length on success, or FALSE
on failure.
Emits an E_WARNING
level error when the cipher algorithm
is unknown.
Example #1 openssl_cipher_iv_length() example
<?php
$method = 'AES-128-CBC' ;
$ivlen = openssl_cipher_iv_length ( $method );
echo $ivlen ;
?>
以上例程的输出类似于:
16
[#1] Tim Hunt [2014-12-10 17:37:37]
The return value is a length in bytes. (Not bits, or anything else.)