Want to remove duplicates in a string

Ragnorack67_at_hotmail.com
Date: 02/27/05 

Date: 27 Feb 2005 13:01:30 -0800

Hello again, I have one further question about improving a validation.
Currently this will validate a string of words separated by commas, and
if it's greater than 9 will do something, or something else if less
than 9. How can I improve this, so before it does the checking remove
any duplicates in the string?

<?
$tmp = explode(',',$your_str);
if (count($tmp) > 9) {
     // do something

} else {

     // do something else

}
?>

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