PHP字符截取函數(shù),兼容各類gbk,utf-8編碼
來源：程序員人生 發(fā)布時(shí)間：2014-02-04 16:59:23 閱讀次數(shù)：2734次
在PHP中字符截取函數(shù)substr只能截取全英文才不會(huì)出現(xiàn)亂碼如果里面有中文肯定是無法截取的,下面小編來給大家介紹兩個(gè)兼容各類gbk,utf-8編碼字符串截取函數(shù),實(shí)例代碼如下:
- 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 $slice;
- }
實(shí)例代碼二:
- function subString_UTF8($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 $r;
- }
-
由于此函數(shù)返回的是一個(gè)數(shù)組,因此要配合join函數(shù)來顯示字符串:join('',subString_UTF8($str, $start, $lenth));,在頁(yè)面顯示的時(shí)候還可以在此語(yǔ)句后面連一個(gè)"..."
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