utf-8字符串截取函数

(转自村子sunggsun)

/** * utf-8编码字符串截取函数 * @param string $string 要截取的字符串 * @param int $start 起始位置 * @param int $length 截取长度 * @param author sunggsun * @date: 2004-12-3 */ function utf8_substr($string, $start, $length=-1) { switch ($length) { case 0: return ”; case -1: return $string; } preg_match_all(“/([x80-xff]{0,3}|[^x80-xff]?)/is”, $string, $arr); $rs = array(); foreach($arr[0] as $key=>$value) { if (trim($value) != ”) { $rs[] = $value; } } $end = $start+$length; $len = 0; $str = ”; foreach ($rs as $key=>$value) { $l = $len+strlen($value); if ($l >= $start && !isset($s)) { $s = $len; } if ($l >= $end && !isset($e)) { $e = $l; break; } $len = $l; } $l = $e – $s; return substr(implode(”, $rs), $s, $l); } $str = “这a是3一b个UTF-8字符串*&^……％￥”; echo $str . ” rn”; $len = strlen($str); for ($i=0; $i