openssl_cipher_iv_length

Gets the cipher iv length

 **openssl_cipher_iv_length** string $cipher_algo

Gets the cipher initialization vector (iv) length.

cipher_algo The cipher method, see for a list of potential values. openssl_get_cipher_methods

Returns the cipher length on success, or false on failure.

Emits an level error when the cipher algorithm is unknown. E_WARNING

Voorbeeld: example

<?php
$method = 'AES-128-CBC';
$ivlen = openssl_cipher_iv_length($method);

echo $ivlen;
?>

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