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php怎样限制字符的显示长度?

像上面这样(截取贴吧的),当字符长度超过固定的像素宽度时,截取像素宽度范围内的字符串,并在字符串后加省略号。mb_strlen函数只能获取字符数,而英文和中文一个字符所占的宽度不一样,不能根据字符数来确定,不知道该怎么实现?

高洛峰高洛峰2806日前742

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  • 黄舟

    黄舟2017-04-10 15:34:44

    那个可以通过 CSS 来控制的… http://jsfiddle.net/sc7uk5bw/

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  • 黄舟

    黄舟2017-04-10 15:34:44

    //截取字符串
    function msubstr($str, $start=0, $length, $charset="utf-8", $suffix=true){
        if(function_exists("mb_substr")){
            if($suffix){
                return mb_substr($str, $start, $length, $charset);
            }else{
                return mb_substr($str, $start, $length, $charset);
            }
        }elseif(function_exists('iconv_substr')) {
            if($suffix){
                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;
        }else{
            return $slice;
        }
    
    }
    

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  • 伊谢尔伦

    伊谢尔伦2017-04-10 15:34:44

    给一个我平时用来截取字符串的方法吧,支持中英文

    php// 截取字符串
    public static function mix_substr($str, $len = 12, $dot = true) {
        $i = 0;
        $l = 0;
        $c = 0;
        $a = array();
        while ($l < $len) {
            $t = substr($str, $i, 1);
            if (ord($t) >= 224) {
                $c = 3;
                $t = substr($str, $i, $c);
                $l += 2;
            } elseif (ord($t) >= 192) {
                $c = 2;
                $t = substr($str, $i, $c);
                $l += 2;
            } else {
                $c = 1;
                $l++;
            }
            // $t = substr($str, $i, $c);
            $i += $c;
            if ($l > $len) break;
            $a[] = $t;
        }
        $re = implode('', $a);
        if (substr($str, $i, 1) !== false) {
            array_pop($a);
            ($c == 1) and array_pop($a);
            $re = implode('', $a);
            $dot and $re .= '...';
        }
        return $re;
    }
    

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