Re: Antithesis to array_unique

Hello, This is a reply to an e-mail that you wrote on Wed, 9 Jul 2003 at 14:55, lines prefixed by '>' were originally written by you. > Having STFM I am wondering if anyone knows of a quick antithesis to > array_unique? We have an array in which we need to return all > duplicate > values instead of the non-duplicates.=20 How about: $array1 = array("dupe","dupe","another item"); $valuecount = array(); foreach($array1 as $value){ if(isset($valuecount[$value])){ $valuecount[$value]++; } else { $valuecount[$value] = 1; } } $dupes = array(); foreach($valuecount as $value=>$count){ if($count>1){ array_push($dupes,$value); } } // $dupes now contains all duplicate values. There may be a quicker way of doing it though... David. -- phpmachine :: The quick and easy to use service providing you with professionally developed PHP scripts :: http://www.phpmachine.com/ Professional Web Development by David Nicholson http://www.djnicholson.com/ QuizSender.com - How well do your friends actually know you? http://www.quizsender.com/ (developed entirely in PHP)