PHP字符截取函数,兼容各类gbk,utf-8编码
来源：程序员人生 发布时间：2014-02-04 16:59:23 阅读次数：2390次
在PHP中字符截取函数substr只能截取全英文才不会出现乱码如果里面有中文肯定是无法截取的,下面小编来给大家介绍两个兼容各类gbk,utf-8编码字符串截取函数,实例代码如下:
- function CsubStrPro($str, $start, $length, $charset = "utf-8", $suffix = false)
- {
- if (function_exists ( "mb_substr" ))
- return mb_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 . "…";
- return $slice;
- }
实例代码二:
- function subString_UTF8($str, $start, $lenth)
- {
- $len = strlen($str);
- $r = array();
- $n = 0;
- $m = 0;
- for($i = 0; $i < $len; $i++) {
- $x = substr($str, $i, 1);
- $a = base_convert(ord($x), 10, 2);
- $a = substr('00000000'.$a, -8);
- if ($n < $start){
- if (substr($a, 0, 1) == 0) {
- }elseif (substr($a, 0, 3) == 110) {
- $i += 1;
- }elseif (substr($a, 0, 4) == 1110) {
- $i += 2;
- }
- $n++;
- }else{
- if (substr($a, 0, 1) == 0) {
- $r[ ] = substr($str, $i, 1);
- }elseif (substr($a, 0, 3) == 110) {
- $r[ ] = substr($str, $i, 2);
- $i += 1;
- }elseif (substr($a, 0, 4) == 1110) {
- $r[ ] = substr($str, $i, 3);
- $i += 2;
- }else{
- $r[ ] = '';
- }
- if (++$m >= $lenth){
- break;
- }
- }
- }
- return $r;
- }
-
由于此函数返回的是一个数组,因此要配合join函数来显示字符串:join('',subString_UTF8($str, $start, $lenth));,在页面显示的时候还可以在此语句后面连一个"..."
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