The php mb_chunk_split function supports wide character splitting

/**
 * Split string
 * @param String $str The string to be split
 * @param int $length The specified length
 * @param String $end The content appended to the split string block
*/
function mb_chunk_split($string, $length, $end, $once = false){
 $string = iconv('gb2312', 'utf- 8//ignore', $string);
 $array = array();
 $strlen = mb_strlen($string);
 while($strlen){
 $array[] = mb_substr($string, 0, $length , "utf-8");
 if($once)
 return $array[0] . $end;
 $string = mb_substr($string, $length, $strlen, "utf-8");
 $strlen = mb_strlen($string);
 }
 return implode($end, $array);
}

$str = 'sThe dfs will arrive at $@# soon';
$str1 = 'aabbccddeefff' ;
echo mb_chunk_split($str, 3, '...', true); //sJune 1st...soon$...df...s is coming to...$@#...
echo "";
echo mb_chunk_split($str1, 2, '...'); //aa...bb...cc...dd...ee...ff.. .f