title: CodeIgniter Image Manipulation Class: How to make thumb_marker in the beginning of file name?
body: <p>I use CodeIgniter Image Manipulation Class to make a Thumbnail of my images.</p>
  
  <p>so the problem is: the property thumb_marker job is inserting '_thumb' just before the file extension, so mypic.jpg would become mypic_thumb.jpg</p>
  
  <p>but what I want is the opposite I need my file name be: thumb_mypic.jpg</p>