note 86824 added to function.mb-split

The code function mbStringToArray ($string) { $strlen = mb_strlen($string); while ($strlen) { $array[] = mb_substr($string,0,1,"UTF-8"); $string = mb_substr($string,1,$strlen,"UTF-8"); $strlen = mb_strlen($string); } return $array; } may be a bit inefficient cuz this asignment : $string = mb_substr($string,1,$strlen,"UTF-8"); in cycle is worth n-i operations, where n - is initial string length and i - the current cycle number. Total complexity of the algorithm becomes O(n*n / 2). I would like propose following algorithm: mb_regex_encoding('UTF-8'); mb_internal_encoding('UTF-8' ); $strArray = array(); for ( $i=0; $i < mb_strlen($str); $i++ ) { $strArray[] = mb_substr($str, $i, 1) ; } Now it depends on the complexity of the mb_substr($str, $i, 1). If it is constant, then the whole algorithm complexity becomes O(n) ---- Server IP: 82.135.230.5 Probable Submitter: 82.135.192.113 ---- Manual Page -- http://www.php.net/manual/en/function.mb-split.php Edit -- https://master.php.net/note/edit/86824 Del: integrated -- https://master.php.net/note/delete/86824/integrated Del: useless -- https://master.php.net/note/delete/86824/useless Del: bad code -- https://master.php.net/note/delete/86824/bad+code Del: spam -- https://master.php.net/note/delete/86824/spam Del: non-english -- https://master.php.net/note/delete/86824/non-english Del: in docs -- https://master.php.net/note/delete/86824/in+docs Del: other reasons-- https://master.php.net/note/delete/86824 Reject -- https://master.php.net/note/reject/86824 Search -- https://master.php.net/manage/user-notes.php