6-13 function_block.php

<?php
if (!function_exists('word_cut')) {
    function word_cut($string, $limit, $pad = "...")
    {
        $len = mb_strlen($string, 'UTF-8');
        if ($len <= $limit) {
            return $string;
        }

        //先找出裁切後的字串有多少英文字
        $tmp_content = mb_substr($string, 0, $limit, 'UTF-8');
        preg_match_all('/(\w)/', $tmp_content, $match);
        $eng = count($match[1]);
        $add = round($eng / 2, 0);
        $limit += $add;
        $string = mb_substr($string, 0, $limit, 'UTF-8');

        return $string . $pad;
    }
}