substr

gistfile1.txt

function sub_str($str,$start=0,$length=60,$left="...",$charset="utf-8")
    {
        if($charset=="utf-8"){
            $index=0; 
            $index1=0; 
            $result="";
            $haslen=0; 
            for($i=0;$i<$length;$i++)
            {
                $index1=$index;
                $len=0;

                $len1=0;
                $first_b=substr($str,$index,1);
                if(ord($first_b)>224){
                    if($i>=$start){
                        $len=3;

                        $len1=3;
                    }
                    $index+=$len;
                    $haslen+=$len;
                }elseif(ord($first_b)>192){
                    if($i>=$start) {
                        $len=2;

                        $len1=2;
                    }
                    $index+=$len;
                    $haslen+=$len;
                }else{
                    if($i>=$start) {
                        $len=1;

                        $len1=1.5;
                    }
                    $index+=$len;
                    $haslen+=$len1;
                }
                if($haslen<=$length){
                    $result.=substr($str,$index1,$len);
                }else{
                    break;
                }
            }
        }else{
            $result=mb_substr($str,$start,$length,$charset);
        }
        if($result!=$str){
            $result.=$left;
        }
        return $result;
    }