title: Disallow characters in text field
body: <p>Should I disallow characters like ",',>,&lt;,\ ... to be typed in an upload forms text field? The text will be send through PHP to a blog. </p>
  
  <p>I heared that some characters might cause trouble and could be used to "hack / harm" servers. Which characters should be restricted?</p>
  
  <p>Thanks for your input.
  Michael    </p>