title: Invisible character look up? (PHP)
body: <p>I'm parsing some files that contain invisible characters.  The files are structured strangely so that I sometimes have to find real information after 9 or 10 invisible characters.  Yeah...</p>
  
  <p>Anyway, I have some files that seem to have invisible characters that my regex doesn't yet know about.  Is there some way to pass a character through a function to look up it's character code?  Since it's invisible, I don't really have much else to go on, ha.</p>
  
  <p>Currently I'm using the following regular expression to find invisible characters. (found from <a href="https://stackoverflow.com/questions/1497885/remove-control-characters-from-php-string">this question</a>)</p>
  
  <pre><code>public $invisibles='\x00-\x09\x0B\x0C\x0E-\x1F\x7F';
  </code></pre>