Editing through webpage

[Anon]

I am creating a file manager for a website. I am using php to open, write, and close the file. The problem that I am having is when you have a file that has some of the same code of the fopen file. For instance.. I have lets say index.php that I want to edit. on fopen.php (which opens and displays the contents of the file) I have a <textarea>Contents of file here</textarea>. The contents of file have a <textarea></textarea> in it. it starts to display everything untill the </textarea>. once it gets to there it puts everything outside of the textarea box. If you understand what I am talking about and can help that would be great.....
Mike Clubb

[Anon]

<?php include("top.inc");
echo "<form method=\"post\" action=\"write.php\">";
$filename = "$file";
$read = fopen("$filename", "rb");
if (!$read)
{
die("Failed to open file <I>$filename</I>.");
}
echo "<input type=hidden name=\"filename\" value=\"";
echo $filename;
echo "\">";
$s = fread($read, filesize($filename));
echo "<textarea cols=\"85\" rows=\"25\" name=\"edit\">";
echo "$s";
echo "</textarea>";
fclose($read);
echo "<br><input type=\"submit\"></form>";
?>

[jeffbarr]

Use the PHP function htmlentities() to turn certain HTML characters into their "entity" equivalents.

Change:

echo "$s";

To:

echo htmlentities($s);