解决php截取中文字符串乱码

发表于 2019-08-15   |   分类于 php
<?php  
$str='我爱你,中国!我爱你,中国!我爱<span class="a">你,中国!';

echo mSubStr($str,0,23,'utf-8');

/**
     * 字符串截取,支持中文和其他编码
     * @access public
     * @param string $str 需要转换的字符串
     * @param integer $start 开始位置
     * @param string $length 截取长度
     * @param string $charset 编码格式
     * @param bool $suffix 截断显示字符
     * @return string
     */
     function mSubStr($str, $start = 0, $length, $charset = "utf-8", $suffix = true) {
        if (function_exists("mb_substr"))
            $slice = mb_substr($str, $start, $length, $charset);
        elseif (function_exists('iconv_substr')) {
            $slice = iconv_substr($str, $start, $length, $charset);
        } else {
            $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));
        }

        return $suffix ? $slice . '...' : $slice;
    }
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