[Memoryz]

PHP код:

if (!isset($_POST['IndentText']))
{ 
    echo "Oh shit, an error occurred.";
    return 0;
} 


If you are trying to prevent the rest of the PHP from continuing on, I'd suggest doing this rather than returning 0. (I don't even think 'return 0' will stop the script from executing)

PHP код:

if (!isset($_POST['IndentText']))
{ 
   die("Oh shit, an error occurred.");
} 


Also, indent.php can be a .html file since it doesn't execute any PHP within the file.

I like it though, very useful.