- <?php
- /**
- * 字符串截取,支持中文和其他编码
- *
- * @param string $str 需要转换的字符串
- * @param string $start 开始位置
- * @param string $length 截取长度
- * @param string $charset 编码格式
- * @param string $suffix 截断字符串后缀
- * @return string
- */
- function substr_ext($str, $start=0, $length, $charset="utf-8", $suffix="")
- {
- if(function_exists("mb_substr")){
- return mb_substr($str, $start, $length, $charset).$suffix;
- }
- elseif(function_exists('iconv_substr')){
- return iconv_substr($str,$start,$length,$charset).$suffix;
- }
- $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 $slice.$suffix;
- }
- //该片段来自于http://www.codesnippet.cn/detail/230520133514.html
来源: http://www.codesnippet.cn/detail/230520133514.html