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<title>Gets the cipher iv length</title>
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</div><hr /><div id="function.openssl-cipher-iv-length" class="refentry">
<div class="refnamediv">
<h1 class="refname">openssl_cipher_iv_length</h1>
<p class="verinfo">(PHP 5 >= PHP 5.3.3)</p><p class="refpurpose"><span class="refname">openssl_cipher_iv_length</span> — <span class="dc-title">Gets the cipher iv length</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.openssl-cipher-iv-length-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">int</span> <span class="methodname"><strong>openssl_cipher_iv_length</strong></span>
( <span class="methodparam"><span class="type">string</span> <code class="parameter">$method</code></span>
)</div>
<p class="para rdfs-comment">
Gets the cipher iv length.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.openssl-cipher-iv-length-parameters">
<h3 class="title">Parameters</h3>
<dl>
<dt>
<span class="term"><em><code class="parameter">method</code></em></span>
<dd>
<p class="para">
The method.
</p>
</dd>
</dt>
</dl>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.openssl-cipher-iv-length-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns the cipher length on success, or <strong><code>FALSE</code></strong> on failure.
</p>
</div>
<div class="refsect1 errors" id="refsect1-function.openssl-cipher-iv-length-errors">
<h3 class="title">Errors/Exceptions</h3>
<p class="para">
Emits an <strong><code>E_WARNING</code></strong> level error when the cipher algorithm
is unknown.
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.openssl-cipher-iv-length-examples">
<h3 class="title">Examples</h3>
<div class="example" id="openssl-cipher-iv-length.example.basic">
<p><strong>Example #1 <span class="function"><strong>openssl_cipher_iv_length()</strong></span> example</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br />$method </span><span style="color: #007700">= </span><span style="color: #DD0000">'AES-128-CBC'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$ivlen </span><span style="color: #007700">= </span><span style="color: #0000BB">openssl_cipher_iv_length</span><span style="color: #007700">(</span><span style="color: #0000BB">$method</span><span style="color: #007700">);<br /><br />echo </span><span style="color: #0000BB">$ivlen</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
<div class="example-contents"><p>The above example will output
something similar to:</p></div>
<div class="example-contents screen">
<div class="cdata"><pre>
16
</pre></div>
</div>
</div>
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