Screenshot extra characters, Chinese and English, to avoid intercepting Chinese garbled characters

Screenshots of extra characters can be made in both Chinese and English. Can you avoid capturing the Chinese ending? ? Garbled code! !

function utf8_strlen($string = null) {
 // Decompose the string into units
 preg_match_all('/./us', $string, $match);
 // Return the number of units
 return count( $match[0]);
 }
 function sub_content($content, $length){
 $len = utf8_strlen($content);
 for($i = 0 ; $i < $len ; $i++){
 $arr[$i] = mb_substr($content,$i,1,'utf-8');
 }
 $get_length = 0;
 $result = '';
 foreach($arr as $code){
 $result .= $code;

 if(strlen($code) > 1){
 $get_length += 2;
 }else{
 $get_length += 1;
 }
 if($get_length >= $ length){
 break;
 }
 }
 return $result;
 }
 echo sub_content($rows["Description"],18);



/**
 * String interception, supports Chinese and other encodings
 * @param string $str
 * @param int $start
 * @param int $length
 * @param string $charset
 * @param boolean $suffix
 * @return string
*/
function w_substr($str , $start = 0, $length, $charset = "utf-8", $suffix = TRUE) {
 $suffix_str = $suffix ? '…' : '';
 if(function_exists('mb_substr')) {
 return mb_substr($str, $start, $length, $charset) . $suffix_str;
 } elseif(function_exists('iconv_substr')) {
 return iconv_substr($str, $start, $length, $charset) . $suffix_str ;
 } else {
 $pattern = array();
 $pattern['utf-8'] = '/[x01-x7f]|[xc2-xdf][x80-xbf]|[xe0-xef][x80 -xbf]{2}|[xf0-xff][x80-xbf]{3}/';
 $pattern['gb2312'] = '/[x01-x7f]|[xb0-xf7][xa0-xfe] /';
 $pattern['gbk'] = '/[x01-x7f]|[x81-xfe][x40-xfe]/';
 $pattern['big5'] = '/[x01-x7f]| [x81-xfe]([x40-x7e]|xa1-xfe])/';
 preg_match_all($pattern[$charset], $str, $matches);
 $slice = implode("", array_slice($matches [0], $start, $length));
 return $slice . $suffix_str;
 }
}