// **********************************************************************
// Simple </> encoding
// Functions implemented by Korbo
// http://goulvench.free.fr/
// 17th of May 2005
// Comments to goulvench@gmail.com are welcome.
// **********************************************************************

// **********************************************************************
// Use this function when adding html to the base.
// unescaped < and > will be parsed,
// \< and \> will be displayed as < and >.
// Additionnally, I replace \n with <br /> and \n\n with a new paragraph.
// Be careful when inside another block element!
// **********************************************************************
function textarea_input_filter($input) {
 $input=str_replace("\r", "", $input);
 $input=str_replace("\n\n", "</p><p>", $input);
 $input=str_replace("\n", "<br />", $input);
 $input = str_replace("&","&amp;",$input);
 $input=str_replace("&amp;amp;", "&amp;", $input);
 $input = str_replace("\<", "\&lt;", $input);
 $input = str_replace("\>", "\&gt;", $input);
return $input;
}

/* Use this function before editing text already in the database.*/
function textarea_input_defilter($input) {
 $input=str_replace("</p><p>", "\n\n", $input);
 $input=str_replace("<br />", "\n", $input);
 $input = str_replace("<", "&lt;", $input);
 $input = str_replace(">", "&gt;", $input);
 $input = str_replace("\&lt;", "\&lt;", $input);
 $input = str_replace("\&gt;", "\&gt;", $input);
return $input ;
}

/* Use this function when outputting to html. */
function display_entity_encode($input) {
 $input=str_replace("<br />\n<br />", "</p><p>", $input);
 $input = str_replace("\&lt;", "&lt;", $input);
 $input = str_replace("\&gt;", "&gt;", $input);
return $input ;
}

/* A very basic function denying any code from user-input. */
function defuse_user_input($input) {
  $input=str_replace("&","&amp;","$input");
  $input=str_replace("<","&lt;","$input");
  $input=str_replace(">","&gt;","$input");
return $input ;
}