title: Codeigniter Wrong MD5
body: <p>I used Codeigniter in my project. And a form submit some datas to a controller.</p>
  
  <p>in the controller;</p>
  
  <pre><code>echo $this-&gt;input-&gt;post('message') ---output---&gt; hello
  
  echo md5($this-&gt;input-&gt;post('message')) ---output---&gt; 5d41402abc4b2a76b9719d911017c592
  </code></pre>
  
  <p>but the md5 of the "hello" is not 5d41402abc4b2a76b9719d911017c592.</p>
  
  <p>Why is this happening and how i solve this problem ?</p>