OpenSSL Functions
openssl_csr_export_to_file
OpenSSL Functions
PHP Manual

# openssl_cipher_iv_length

(PHP 5 >= PHP 5.3.3)

openssl_cipher_iv_length — Gets the cipher iv length

### Description

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.

### Return Values

Returns the cipher length on success, or `FALSE` on failure.

### Errors/Exceptions

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

### Examples

Example #1 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

OpenSSL Functions
openssl_csr_export_to_file
OpenSSL Functions
PHP Manual