PHP string interception small example PHP function intercepts fixed length string

function toFixLen($str,$len){ //Interception of fixed-length string
if($len>=strlen($str)||!$len)return$str;
 $len-=3;
 $tempstr1=substr($str,0,$len); //Intercept string
 $tempstr2=preg_replace('/([x81-xff]+)$/ms','' ,$tempstr1,1); //Remove the consecutive Chinese characters at the end
 if(!is_int((strlen($tempstr1)-strlen($tempstr2))/2)){ //The removed characters are an odd number?
 $tempstr1 =substr($str,0,$len-1);
 }
return$tempstr1."…";
}
?>