pathinfo() expects parameter 1 to be string array given codeigniter
<p>Here is my code</p>

<pre><code>$filename = $_FILES[$file_element_name]['name'];

$ext = pathinfo($filename, PATHINFO_EXTENSION);
</code></pre>

<p>Why this line throws an error </p>

<blockquote>
  <p><code>pathinfo()</code> expects parameter 1 to be string array given</p>
</blockquote>