PHP interception function for mixed Chinese and English strings

/**
* Intercept mixed Chinese and English strings
* by bbs.it-home.org
*/
function mb_str_split($string){
 # Split at all position not after the start: ^
 # and not before the end : $
 //$string = iconv('gb2312', 'utf-8//ignore', $string);
 return preg_split('/(?}
$string = 'q345e q345d q345c, q345d round steel, q345e round steel nm360a wear-resistant plate, European standard s355 low alloy plate bs700mc automotive plate, automotive qste460tm structural steel, Ship plate ah36/eh36/dh36, American standard container plate weathering steel spring steel';
//$charlist = mb_str_split($string);
echo mb_chunk_split($string, 30, '..', true);
echo ' ';
echo mb_chunk_split($string, 10, '');

function mb_chunk_split($string, $length, $end = '..', $once = false){
 / /$string = iconv('gb2312', 'utf-8//ignore', $string);
 $charlist = mb_str_split($string);
 $i = 0;
 $j = 0;
 $once_array = array ();
 foreach($charlist as $value){
 /* if($once){
 if(($i + $j) > $length){
 $i--; //as few as possible
 break;
 }
 }else{
 if(($i + $j) >= $length){
 $once_array[] = implode('', array_slice($charlist, $once_leng, $i));
 $once_leng += $i;
 $i = $j = 0;
 }
 } */

 if(($i + $j) >= $length){
 if($once)
 return implode ('', array_slice($charlist, 0, $i-1)) . (count($charlist) <= $i ? '' : $end);
 $once_array[] = $i;
 $i = $j = 0;
 }


 if(ord($value) > 127)
 $j++; //Chinese counts as 2 widths
 /*if($value == ',')
 $j-- ;*/
 $i++;
 }
 //End padding
 if(array_sum($once_array) < count($charlist))
 $once_array[] = $i;

 $str_arr = array();
 $once_leng = 0;
 foreach($once_array as $value){
 $str_arr[] = implode('', array_slice($charlist, $once_leng, $value));
 $once_leng += $value;
 }

 return implode($end, $str_arr);
 //return implode('', array_slice($charlist, 0, $i)) . (count($charlist) <= $i ? '' : $end) ;
}
?>