How to solve the problem that the thinkphp interception string function cannot display the ellipses?

For the situation where thinkphp’s interception string function cannot display the ellipses, you can refer to the following solutions: Open the common/extend.php page and modify the msubstr function to:

function msubstr($str, $start=0, $length, $charset="utf-8", $suffix=true)
{
 if(function_exists("mb_substr")) {
 if( $suffix)
 {
 if($str==mb_substr($str, $start, $length, $charset))
 {
 return mb_substr($str, $start, $length, $charset);
 }
 else
 {
 return mb_substr($str, $start, $length, $charset)."...";
 }
 } // bbs.it-home.org
 else
 {
 return mb_substr($str, $ start, $length, $charset);
 }
 }
 elseif(function_exists('iconv_substr')) {
 if($suffix)
 {
 if($str==iconv_substr($str,$start,$length, $charset))
 {
 return iconv_substr($str,$start,$length,$charset);
 }
 else
 {
 return iconv_substr($str,$start,$length,$charset)."... ";
 }
 }
 else
 {
 return iconv_substr($str,$start,$length,$charset);
 }
 }
 $re['utf-8'] = "/[x01-x7f]| [xc2-xdf][x80-xbf]|[xe0-xef][x80-xbf]{2}|[xf0-xff][x80-xbf]{3}/";
 $re['gb2312'] = "/[x01-x7f]|[xb0-xf7][xa0-xfe]/";
 $re['gbk'] = "/[x01-x7f]|[x81-xfe][x40-xfe]/" ;
 $re['big5'] = "/[x01-x7f]|[x81-xfe]([x40-x7e]|xa1-xfe])/";
 preg_match_all($re[$charset], $str , $match);
 $slice = join("",array_slice($match[0], $start, $length));
 if($suffix) return $slice."…";
 return $slice;
 }

Use the above function to display the ellipsis when intercepting the string. You can test it to see the effect.