title: apply_filters() function in wordpress
body: <p>hey guys im really frustrated </p>
  
  <p>im looking for a way to retrieve back  my slug to the normal text as  wordpress does </p>
  
  <p>in wordpress there is a function to do so :</p>
  
  <p>apply_filters('editable_slug', $slug)</p>
  
  <p>i search all related files to find what this function does, but couldn't understand a bit.</p>
  
  <p>as ypu may know , making a slug out of a normal text is a easy job , but when its converted ,  for Utf-8 languages such as Arabic , words will be changed to  unreadable unicodes . </p>
  
  <p>e.g.  :</p>
  
  <p><a href="http://localhost/page/%d8%a7%d9%84%d9%84%d9%87" rel="nofollow noreferrer">http://localhost/page/%d8%a7%d9%84%d9%84%d9%87</a></p>
  
  <p>do you know how this function works in wordpress ?</p>
  
  <p>apply_filters('editable_slug', $slug)</p>
  
  <p>and how i can do the same in my own php project ?</p>