ss="nb">bin2hex</span><span class="p">(</span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">encryption</span><span class="o">-&gt;</span><span class="na">create_key</span><span class="p">(</span><span class="mi">16</span><span class="p">));</span>

<span class="c1">// Put the same value in your config with hex2bin(),</span>
<span class="c1">// so that it is still passed as binary to the library:</span>
<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;e