note 117314 added to function.preg-replace

Warning, preg_replace() has an unexpected behaviour on UTF-8 strings when you use an empty regular expression like "/()/" ! If you build your regular expression in PHP like this : $words = array(); foreach (explode(" ", $what) as $w) if (mb_strlen($w) > 0) $words[] = preg_quote($w, "/"); return preg_replace('/(' . implode("|",$words) . ')/iu', '<span class="text-maroon">\\1</span>', $text); Always check if $words array isn't empty : if (count($words) == 0) return $text; ---- Server IP: 72.52.91.14 Probable Submitter: 80.13.205.55 ---- Manual Page -- http://php.net/manual/en/function.preg-replace.php Edit -- https://master.php.net/note/edit/117314 Del: integrated -- https://master.php.net/note/delete/117314/integrated Del: useless -- https://master.php.net/note/delete/117314/useless Del: bad code -- https://master.php.net/note/delete/117314/bad+code Del: spam -- https://master.php.net/note/delete/117314/spam Del: non-english -- https://master.php.net/note/delete/117314/non-english Del: in docs -- https://master.php.net/note/delete/117314/in+docs Del: other reasons-- https://master.php.net/note/delete/117314 Reject -- https://master.php.net/note/reject/117314 Search -- https://master.php.net/manage/user-notes.php