改造phpcms-v9自带的字符串截取函数

1.phpcms-v9自带的字符串截取函数在phpcms/libs/functions/global.func.php文件中：

/** 
 * 字符截取 支持UTF8/GBK 
 * @param $string 
 * @param $length 
 * @param $dot 
 */  
function str_cut($string, $length, $dot = ‘...‘) {  
    $strlen = strlen($string);  
    if($strlen <= $length) return $string;  
    $string = str_replace(array(‘ ‘,‘ ‘, ‘&‘, ‘"‘, ‘‘‘, ‘“‘, ‘”‘, ‘—‘, ‘<‘, ‘>‘, ‘·‘, ‘…‘), array(‘∵‘,‘ ‘, ‘&‘, ‘"‘, "‘", ‘“‘, ‘”‘, ‘—‘, ‘<‘, ‘>‘, ‘·‘, ‘…‘), $string);  
    $strcut = ‘‘;  
    if(strtolower(CHARSET) == ‘utf-8‘) {  
        $length = intval($length-strlen($dot)-$length/3);  
        $n = $tn = $noc = 0;  
        while($n < strlen($string)) {  
            $t = ord($string[$n]);  
            if($t == 9 || $t == 10 || (32 <= $t && $t <= 126)) {  
                $tn = 1; $n++; $noc++;  
            } elseif(194 <= $t && $t <= 223) {  
                $tn = 2; $n += 2; $noc += 2;  
            } elseif(224 <= $t && $t <= 239) {  
                $tn = 3; $n += 3; $noc += 2;  
            } elseif(240 <= $t && $t <= 247) {  
                $tn = 4; $n += 4; $noc += 2;  
            } elseif(248 <= $t && $t <= 251) {  
                $tn = 5; $n += 5; $noc += 2;  
            } elseif($t == 252 || $t == 253) {  
                $tn = 6; $n += 6; $noc += 2;  
            } else {  
                $n++;  
            }  
            if($noc >= $length) {  
                break;  
            }  
        }  
        if($noc > $length) {  
            $n -= $tn;  
        }  
        $strcut = substr($string, 0, $n);  
        $strcut = str_replace(array(‘∵‘, ‘&‘, ‘"‘, "‘", ‘“‘, ‘”‘, ‘—‘, ‘<‘, ‘>‘, ‘·‘, ‘…‘), array(‘ ‘, ‘&‘, ‘"‘, ‘‘‘, ‘“‘, ‘”‘, ‘—‘, ‘<‘, ‘>‘, ‘·‘, ‘…‘), $strcut);  
    } else {  
        $dotlen = strlen($dot);  
        $maxi = $length - $dotlen - 1;  
        $current_str = ‘‘;  
        $search_arr = array(‘&‘,‘ ‘, ‘"‘, "‘", ‘“‘, ‘”‘, ‘—‘, ‘<‘, ‘>‘, ‘·‘, ‘…‘,‘∵‘);  
        $replace_arr = array(‘&‘,‘ ‘, ‘"‘, ‘‘‘, ‘“‘, ‘”‘, ‘—‘, ‘<‘, ‘>‘, ‘·‘, ‘…‘,‘ ‘);  
        $search_flip = array_flip($search_arr);  
        for ($i = 0; $i < $maxi; $i++) {  
            $current_str = ord($string[$i]) > 127 ? $string[$i].$string[++$i] : $string[$i];  
            if (in_array($current_str, $search_arr)) {  
                $key = $search_flip[$current_str];  
                $current_str = str_replace($search_arr[$key], $replace_arr[$key], $current_str);  
            }  
            $strcut .= $current_str;  
        }  
    }  
    return $strcut.$dot;  
}  
  
//weiyanhui自己添加,字符串截取函数，建议使用自己写的字符串截取函数,需要在php.ini中开启php_mbstring.dll扩展  
function str_cut1($string, $length, $dot = ‘...‘) {  
    return mb_substr($string,0,$length,‘utf-8‘).$dot;  
}  

echo str_cut1("abcdefg",3,"...");//结果：abc...
echo str_cut1("我们都是中国人",3,"...");//结果：我们都...
不管是字母还是中文，都截取制定的长度