(PHP 5 >= PHP 5.3.3, PHP 7)
Gets the cipher iv length
int openssl_cipher_iv_length ( string $method )
Gets the cipher initialization vector (iv) length.
Parameters:
method
The cipher method, see openssl_get_cipher_methods() for a list of potential values.
Returns:
Returns the cipher length on success, or FALSE on failure.
Exception:
Emits an E_WARNING level error when the cipher algorithm is unknown.
Examples:
openssl_cipher_iv_length() example
<?php $method = 'AES-128-CBC'; $ivlen = openssl_cipher_iv_length($method); echo $ivlen; ?>
The above example will output something similar to:
16
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