<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.openssl-cipher-iv-length" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>openssl_cipher_iv_length</refname>
  <refpurpose>Gets the cipher iv length</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>int</type><type>false</type></type><methodname>openssl_cipher_iv_length</methodname>
   <methodparam><type>string</type><parameter>cipher_algo</parameter></methodparam>
  </methodsynopsis>
  <para>
   Gets the cipher initialization vector (iv) length.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <variablelist>
   <varlistentry>
    <term><parameter>cipher_algo</parameter></term>
    <listitem>
     <para>
      The cipher method, see <function>openssl_get_cipher_methods</function> for a list of potential values.
     </para>
    </listitem>
   </varlistentry>
  </variablelist>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns the cipher length on success, or &false; on failure. 
  </para>
 </refsect1>

 <refsect1 role="errors">
  &reftitle.errors;
  <para>
   Emits an <constant>E_WARNING</constant> level error when the cipher algorithm
   is unknown.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <example xml:id="openssl-cipher-iv-length.example.basic">
   <title><function>openssl_cipher_iv_length</function> example</title>
   <programlisting role="php">
<![CDATA[
<?php
$method = 'AES-128-CBC';
$ivlen = openssl_cipher_iv_length($method);

echo $ivlen;
?>
]]>
   </programlisting>
   &example.outputs.similar;
   <screen>
<![CDATA[
16
]]>
   </screen>
  </example>
 </refsect1>

</refentry>
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