note 126221 added to function.array-unique

If you're looking for the fastest way to remove duplicate words in a string, because you may do so in the millions (because it doesn't matter if you do only some thousands) and use this code: $result = implode(" ", array_unique( explode(" ", $string) )); Then there is currently (2021) with the most recent PHP 7/8 versions only one faster alternative: $result = preg_replace("/\b(\w+)\s+\\1\b/i", "$1", $string); will remove all consecutive duplicate words and it's the fastest of all, taking only 30-40% of the time. $result = preg_replace("/\b(\w+)\s+.*\\1\b/i", "$1", $string); will remove all duplicate words anywhere in the string, requiring about 80%-85% of the time. Of course, all speeds may vary depending on the length of your strings and their content. Please test for your case. ---- Server IP: 45.112.84.4 Probable Submitter: 45.112.85.242 (proxied: 2a02:8108:413f:a5e0:c1d0:4e87:142b:7b65) ---- Manual Page -- https://php.net/manual/en/function.array-unique.php Edit -- https://main.php.net/note/edit/126221 Del: integrated -- https://main.php.net/note/delete/126221/integrated Del: useless -- https://main.php.net/note/delete/126221/useless Del: bad code -- https://main.php.net/note/delete/126221/bad+code Del: spam -- https://main.php.net/note/delete/126221/spam Del: non-english -- https://main.php.net/note/delete/126221/non-english Del: in docs -- https://main.php.net/note/delete/126221/in+docs Del: other reasons-- https://main.php.net/note/delete/126221 Reject -- https://main.php.net/note/reject/126221 Search -- https://main.php.net/manage/user-notes.php