来自PHPCMS
- /**
- * 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;
- }
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