RE: [PHP] removing all duplicate values from an array

> -----Original Message----- > From: Mike Migurski [mailto:mike@saturn5.com] > Sent: Thursday, October 30, 2003 1:37 PM > To: Allowee > Cc: php-general@lists.php.net > Subject: Re: [PHP] removing all duplicate values from an array > > >>I'm looking for a function that does almost the same as array_unique() > >> > >>But it must also delete the other duplicate entry. > ><snip> > > > >Untested pseudo-PHP follows - > > > > $encountered_elements = array(); > > foreach($original_array as $key => $val) > > if(in_array($val, $encountered_elements)) { > > unset($original_array[$key]); > > } else { > > $encountered_elements[$key] = $val; > > } > > Oops, that should have been: > > $encountered_elements = array(); > foreach($original_array as $key => $val) > if(in_array($val, $encountered_elements)) { > unset($original_array[$encountered_elements[$val]]); > } else { > $encountered_elements[$val] = $key; > } > > I was running Allowee's example array.. array( 'a' => 'one', 'b' => 'one', 'c' => 'zero', 'd' => 'two' ); through this and am having a hind time with then logic... Could you explain how the output would be array('c' => 'zero', 'd' => 'two')?? Thanks