Cannot Redclare Function

[Unholy Prayer]

Ok, I'm getting an error with this function and I don't know why.  This is the error message that I'm getting:
[quote]Fatal error: Cannot redeclare clean() (previously declared in /home/dev/public_html/portal/functions.php:9) in /home/dev/public_html/portal/functions.php on line 9[/quote]

These are the contents of functions.php:
[code]
<?php

function clean($string) {

$string = addslashes($string);

$string = strip_tags($string);

$string = htmlspecialchars($string);

$string = trim($string);

return $string;

}

?> [/code]

Can someone please help me?

[Psycho]

It looks as if you are including functions.php in multiple places. Use either include_once() or require_once() to prevent that page from being read twice.