I need a script written in PHP to remove duplicate email
(text@text.text) from a variable. Example script:
$emails = "email1@domain.com email2@domain.com email1@domain.com";
echo remove_duplicates($emails); // should show email1@domain.com only once

Thanks

---

Clarification of Question by vladuzca-ga on 06 Sep 2005 19:34 PDT

I'd also like to note that delimiters are random (can be a space, long
text or just a line feed)

Hello 

Thank-you for your question.

The following script should do what you require.  It uses a regular
expression to match email addresses in a string.  These email
addresses are placed in an array from which duplicates are then
removed.

=====================================
$emails = "email1@domain.com email2@domain.com email1@domain.com
email1@domain.com email3@test.co.uk";
print $emails."<br />";
print remove_duplicates($emails);
 
function remove_duplicates($str) {
  # match all email addresses using a regular expression and store them
  # in an array called $results
  preg_match_all("([\w-]+(?:\.[\w-]+)*@(?:[\w-]+\.)+[a-zA-Z]{2,7})",$str,$results);
  # sort the results alphabetically
  sort($results[0]);
  # remove duplicate results by comparing it to the previous value
  $prev="";
  while(list($key,$val)=each($results[0])) {
    if($val==$prev) unset($results[0][$key]);
    else $prev=$val;
  }
  # process the array and return the remaining email addresses
  $str = "";
  foreach ($results[0] as $value) {
     $str .= " ".$value;
  }
  return $str;
};
================================================

If you require any further assistance on this subject please ask for
clarification and I will do my best to respond swiftly.

Quick answer and he/she took the time to comment the script!

Thank-you for the rating, kind comments and tip - they are all appreciated.